Get Deep into Hacker

In computing, a hacker is any highly skilled computer expert capable of breaking into computer systems and networks using bugs and exploits. Depending on the field of computing it has slightly different meanings, and in some contexts has controversial moral and ethical connotations. In its original sense, the term refers to a person in any one of the communities and hacker subcultures:[1]

  • Hacker culture, an idea derived from a community of enthusiast computer programmers and systems designers, in the 1960s around the Massachusetts Institute of Technology’s (MIT’s) Tech Model Railroad Club (TMRC) and MIT Artificial Intelligence Laboratory.[2] The hobbyist home computing community, focusing on hardware in the late 1970s (e.g. the Homebrew Computer Club)[3] and on software (video games,[4] software cracking, the demoscene) in the 1980s/1990s. Later, this would go on to encompass many new definitions such as art, and Life hacking.
  • Hacker (computer security). People involved with circumvention of computer security. This primarily concerns unauthorized remote computer break-ins via communication networks such as the Internet (Black hats), but also includes those who debug or fix security problems (White hats), and the morally ambiguous Grey hats.

Grey hats are hackers who are neither good nor bad, and often include people who hack ‘for fun’ or to ‘troll’. They may both fix and exploit, though grey hats are usually associated with black hat hackers.

Black hats are hackers with malicious intentions, and steal, exploit, and sell data. They are usually motivated by personal gain.

White hats are hackers employed with the efforts of keeping data safe from other hackers by looking for loopholes and hackable areas. This type of hacker typically gets paid quite well, and receives no jail time due to the consent of the company that hired them.


  • 1Hacker definition rumours
  • 2Overlaps and differences
  • 3Cracker vs Hacker
  • 4References
  • 5Further reading
    • 5.1Computer security
    • 5.2Free software/open source

Hacker definition rumours[edit]

Today, mainstream usage of “hacker” mostly refers to computer criminals, due to the mass media usage of the word since the 1980s. This includes what hacker slang calls “script kiddies,” people breaking into computers using programs written by others, with very little knowledge about the way they work. This usage has become so predominant that the general public is unaware that different meanings exist.[5] While the self-designation of hobbyists as hackers is acknowledged by all three kinds of hackers, and the computer security hackers accept all uses of the word, people from the programmer subculture consider the computer intrusion related usage incorrect, and emphasize the difference between the two by calling security breakers “crackers” (analogous to a safecracker).

Currently, “hacker” is used in two main conflicting ways:

  1. as someone who is able to subvert computer security; if doing so for malicious purposes, the person can also be called a cracker.[6]
  2. an adherent of the technology and programming subculture.

The controversy is usually based on the assumption that the term originally meant someone messing about with something in a positive sense, that is, using playful cleverness to achieve a goal. But then, it is supposed, the meaning of the term shifted over the decades since it first came into use in a computer context and came to refer to computer criminals.[7]

As usage has spread more widely, the primary misunderstanding of newer users conflicts with the original primary emphasis. In popular usage and in the media, computer intruders or criminals is the exclusive meaning today, with associated pejorative connotations. (For example, “An Internet ‘hacker’ broke through state government security systems in March.”) In the computing community, the primary meaning is a complimentary description for a particularly brilliant programmer or technical expert. (For example, “Linus Torvalds, the creator of Linux, is considered by some to be a hacker.”) A large segment of the technical community insist the latter is the “correct” usage of the word (see the Jargon File definition below).

The mainstream media’s current usage of the term may be traced back to the early 1980s. When the term was introduced to wider society by the mainstream media in 1983, even those in the computer community referred to computer intrusion as “hacking”, although not as the exclusive use of that word. In reaction to the increasing media use of the term exclusively with the criminal connotation, the computer community began to differentiate their terminology. Alternative terms such as “cracker” were coined in an effort to distinguish between those adhering to the historical use of the term “hack” within the programmer community and those performing computer break-ins. Further terms such as “black hat”, “white hat” and “gray hat” developed when laws against breaking into computers came into effect, to distinguish criminal activities and those activities which were legal.

However, since network news use of the term pertained primarily to the criminal activities despite this attempt by the technical community to preserve and distinguish the original meaning, the mainstream media and general public continue to describe computer criminals with all levels of technical sophistication as “hackers” and do not generally make use of the word in any of its non-criminal connotations. Members of the media sometimes seem unaware of the distinction, grouping legitimate “hackers” such as Linus Torvalds and Steve Wozniak along with criminal “crackers”.[8]

As a result of this difference, the definition is the subject of heated controversy. The wider dominance of the pejorative connotation is resented by many who object to the term being taken from their cultural jargon and used negatively,[9] including those who have historically preferred to self-identify as hackers. Many advocate using the more recent and nuanced alternate terms when describing criminals and others who negatively take advantage of security flaws in software and hardware. Others prefer to follow common popular usage, arguing that the positive form is confusing and unlikely to become widespread in the general public. A minority still use the term in both original senses despite the controversy, leaving context to clarify (or leave ambiguous) which meaning is intended.

However, the positive definition of hacker was widely used as the predominant form for many years before the negative definition was popularized. “Hacker” can therefore be seen as a shibboleth, identifying those who use the technically oriented sense (as opposed to the exclusively intrusion-oriented sense) as members of the computing community. Due to the variety of industry a software designer may find themselves in many prefer not to be referred to as ‘Hacker’ as the word Hack holds a negative denotation in many of those industries.

A possible middle ground position has been suggested, based on the observation that “hacking” describes a collection of skills and tools which are used by hackers of both descriptions for differing reasons. The analogy is made to locksmithing, specifically picking locks, which—aside from its being a skill with a fairly high tropism to ‘classic’ hacking—is a skill which can be used for good or evil. The primary weakness of this analogy is the inclusion of script kiddies in the popular usage of “hacker”, despite the lack of an underlying skill and knowledge base. Sometimes, hacker also is simply used synonymous to geek: “A true hacker is not a group person. He’s a person who loves to stay up all night, he and the machine in a love-hate relationship… They’re kids who tended to be brilliant but not very interested in conventional goals[…] It’s a term of derision and also the ultimate compliment.”[10]

Fred Shapiro thinks that “the common theory that ‘hacker’ originally was a benign term and the malicious connotations of the word were a later perversion is untrue.” He found out that the malicious connotations were present at MIT in 1963 already (quoting The Tech, an MIT student newspaper) and then referred to unauthorized users of the telephone network,[11][12] that is, the phreaker movement that developed into the computer security hacker subculture of today.

Overlaps and differences[edit]

The main basic difference between programmer subculture and computer security hackers is their mostly separate historical origin and development. However, the Jargon File reports that considerable overlap existed for the early phreaking at the beginning of the 1970s. An article from MIT’s student paper The Tech used the term hacker in this context already in 1963 in its pejorative meaning for someone messing with the phone system.[11] The overlap quickly started to break when people joined in the activity who did it in a less responsible way.[13] This was the case after the publication of an article exposing the activities of Draper and Engressia.

According to Raymond, hackers from the programmer subculture usually work openly and use their real name, while computer security hackers prefer secretive groups and identity-concealing aliases.[14] Also, their activities in practice are largely distinct. The former focus on creating new and improving existing infrastructure (especially the software environment they work with), while the latter primarily and strongly emphasize the general act of circumvention of security measures, with the effective use of the knowledge (which can be to report and help fixing the security bugs, or exploitation reasons) being only rather secondary. The most visible difference in these views was in the design of the MIT hackers’ Incompatible Timesharing System, which deliberately did not have any security measures.

There are some subtle overlaps, however, since basic knowledge about computer security is also common within the programmer subculture of hackers. For example, Ken Thompson noted during his 1983 Turing Award lecture that it is possible to add code to the UNIX “login” command that would accept either the intended encrypted password or a particular known password, allowing a back door into the system with the latter password. He named his invention the “Trojan horse”. Furthermore, Thompson argued, the C compiler itself could be modified to automatically generate the rogue code, to make detecting the modification even harder. Because the compiler is itself a program generated from a compiler, the Trojan horse could also be automatically installed in a new compiler program, without any detectable modification to the source of the new compiler. However, Thompson disassociated himself strictly from the computer security hackers: “I would like to criticize the press in its handling of the ‘hackers,’ the 414 gang, the Dalton gang, etc. The acts performed by these kids are vandalism at best and probably trespass and theft at worst. … I have watched kids testifying before Congress. It is clear that they are completely unaware of the seriousness of their acts.”[15]

The programmer subculture of hackers sees secondary circumvention of security mechanisms as legitimate if it is done to get practical barriers out of the way for doing actual work. In special forms, that can even be an expression of playful cleverness.[16] However, the systematic and primary engagement in such activities is not one of the actual interests of the programmer subculture of hackers and it does not have significance in its actual activities, either.[14] A further difference is that, historically, members of the programmer subculture of hackers were working at academic institutions and used the computing environment there. In contrast, the prototypical computer security hacker had access exclusively to a home computer and a modem. However, since the mid-1990s, with home computers that could run Unix-like operating systems and with inexpensive internet home access being available for the first time, many people from outside of the academic world started to take part in the programmer subculture of hacking.

Since the mid-1980s, there are some overlaps in ideas and members with the computer security hacking community. The most prominent case is Robert T. Morris, who was a user of MIT-AI, yet wrote the Morris worm. The Jargon File hence calls him “a true hacker who blundered”.[17] Nevertheless, members of the programmer subculture have a tendency to look down on and disassociate from these overlaps. They commonly refer disparagingly to people in the computer security subculture as crackers, and refuse to accept any definition of hacker that encompasses such activities. The computer security hacking subculture on the other hand tends not to distinguish between the two subcultures as harshly, instead acknowledging that they have much in common including many members, political and social goals, and a love of learning about technology. They restrict the use of the term cracker to their categories of script kiddies and black hat hackers instead.

All three subcultures have relations to hardware modifications. In the early days of network hacking, phreaks were building blue boxes and various variants. The programmer subculture of hackers has stories about several hardware hacks in its folklore, such as a mysterious ‘magic’ switch attached to a PDP-10 computer in MIT’s AI lab, that, when turned off, crashed the computer.[18] The early hobbyist hackers built their home computers themselves, from construction kits. However, all these activities have died out during the 1980s, when the phone network switched to digitally controlled switchboards, causing network hacking to shift to dialing remote computers with modems, when pre-assembled inexpensive home computers were available, and when academic institutions started to give individual mass-produced workstation computers to scientists instead of using a central timesharing system. The only kind of widespread hardware modification nowadays is case modding.

An encounter of the programmer and the computer security hacker subculture occurred at the end of the 1980s, when a group of computer security hackers, sympathizing with the Chaos Computer Club (who disclaimed any knowledge in these activities), broke into computers of American military organizations and academic institutions. They sold data from these machines to the Soviet secret service, one of them in order to fund his drug addiction. The case was solved when Clifford Stoll, a scientist working as a system administrator, found ways to log the attacks and to trace them back (with the help of many others). 23, a German film adaption with fictional elements, shows the events from the attackers’ perspective. Stoll described the case in his book The Cuckoo’s Egg and in the TV documentary The KGB, the Computer, and Me from the other perspective. According to Eric S. Raymond, it “nicely illustrates the difference between ‘hacker’ and ‘cracker’. Stoll’s portrait of himself, his lady Martha, and his friends at Berkeley and on the Internet paints a marvelously vivid picture of how hackers and the people around them like to live and how they think.”[19]

Cracker vs Hacker[edit]

A cracker (also known as a black hat hacker)[20] is someone who knows the web similar to hackers and doesn’t use the internet for gaining any extensive knowledge and are professionals in what they do but they are not the white collar heroes as security hackers are. Crackers use their skills to earn themselves profits or to benefit from criminal gain. Crackers find exploits to systems securities and vulnerabilities but often use them to their advantage by either selling the fix to the company themselves or keeping the exploit and selling it to other black hat hackers to steal information or gain royalties.


  1. Jump up^ Löwgren, Jonas (February 23, 2000). “Hacker culture(s): Origins”. Retrieved 2008-10-18.
  2. Jump up^ Raymond, Eric (25 August 2000). “The Early Hackers”. A Brief History of Hackerdom. Thyrsus Enterprises. Retrieved 6 December 2008.
  3. Jump up^ Levy, part 2
  4. Jump up^ Levy, part 3
  5. Jump up^ Yagoda, Ben. “A Short History of “Hack””. The New Yorker. Retrieved November 3, 2015.
  6. Jump up^ “Internet Users’ Glossary”. Archived from the original on 2016-06-05.RFC 1983
  7. Jump up^ “Internet Users’ Glossary”. Archived from the original on 2016-05-16.RFC 1392
  8. Jump up^ DuBois, Shelley. “A who’s who of hackers”. Reporter. Fortune Magazine. Retrieved 19 June 2011.
  9. Jump up^ “TMRC site”. Archived from the original on 2006-05-03.
  10. Jump up^ Alan Kay quoted in Stewart Brand, “S P A C E W A R: Fanatic Life and Symbolic Death Among the Computer Bums:” In Rolling Stone (1972)
  11. ^ Jump up to:a b Fred Shapiro: Antedating of “Hacker”. American Dialect Society Mailing List(13. June 2003)
  12. Jump up^ “The Origin of “Hacker””.
  13. Jump up^ phreaking. The Jargon Lexicon. Retrieved 2008-10-18.
  14. ^ Jump up to:a b cracker. The Jargon Lexicon. Retrieved 2008-10-18.
  15. Jump up^ Thompson, Ken (August 1984). “Reflections on Trusting Trust” (PDF). Communications of the ACM. 27 (8): 761. doi:10.1145/358198.358210.
  16. Jump up^ Richard Stallman (2002). “The Hacker Community and Ethics: An Interview with Richard M. Stallman”. GNU Project. Retrieved 2008-10-18.
  17. Jump up^ Part III. Appendices. The Jargon Lexicon. Retrieved 2008-10-18.
  18. Jump up^ A Story About ‘Magic’. The Jargon Lexicon. Retrieved 2008-10-18.
  19. Jump up^ Part III. Appendices. The Jargon Lexicon. Retrieved 2008-10-18.
  20. Jump up^ “What are crackers and hackers? | Security News”. Retrieved 2016-09-10.

Further reading[edit]

  • Michael Hasse: Die Hacker: Strukturanalyse einer jugendlichen Subkultur (1994)

Computer security[edit]

  • Logik Bomb: Hacker’s Encyclopedia (1997)
  • Revelation: The Ultimate Beginner’s Guide to Hacking & Phreaking (1996)
  • Hafner, Katie; Markoff, John (1991). Cyberpunk: Outlaws and Hackers on the Computer Frontier. New York: Simon & Schuster. ISBN 0-671-68322-5.
  • Sterling, Bruce (1992). The Hacker Crackdown. Bantam. ISBN 0-553-08058-X.
  • Slatalla, Michelle; Joshua Quittner (1995). Masters of Deception: The Gang That Ruled Cyberspace. HarperCollins. ISBN 0-06-017030-1.
  • Dreyfus, Suelette (1997). Underground: Tales of Hacking, Madness and Obsession on the Electronic Frontier. Mandarin. ISBN 1-86330-595-5.
  • Verton, Dan (2002). The Hacker Diaries : Confessions of Teenage Hackers. McGraw-Hill Osborne Media. ISBN 0-07-222364-2.
  • Thomas, Douglas (2002). Hacker Culture. University of Minnesota Press. ISBN 0-8166-3345-2.
  • Taylor, Paul A. (1999). Hackers: Crime in the Digital Sublime. Routledge. ISBN 978-0-415-18072-6.
  • Levy, Steven (2002). Crypto: How the Code Rebels Beat the Government Saving Privacy in the Digital Age. Penguin. ISBN 0-14-024432-8.
  • Ventre, Daniel (2009). Information Warfare. Wiley – ISTE. ISBN 978-1-84821-094-3.

Free software/open source[edit]

  • Raymond, Eric S.; Steele, Guy L., eds. (1996). The New Hacker’s Dictionary. The MIT Press. ISBN 0-262-68092-0.
  • Raymond, Eric S. (2003). The Art of Unix Programming. Prentice Hall International. ISBN 0-13-142901-9.
  • Levy, Steven (1984). Hackers: Heroes of the Computer Revolution. Doubleday. ISBN 0-385-19195-2.
  • Turkle, Sherry (1984). The Second Self: Computers and the Human Spirit. MIT Press. ISBN 0-262-70111-1.
  • Graham, Paul (2004). Hackers and Painters. Beijing: O’Reilly. ISBN 0-596-00662-4.
  • Lakhani, Karim R.; Wolf, Robert G. (2005). “Why Hackers Do What They Do: Understanding Motivation and Effort in Free/Open Source Software Projects” (PDF). In Feller, J.; Fitzgerald, B.; Hissam, S.; et al. Perspectives on Free and Open Source Software. MIT Press.
  • Himanen, Pekka (2001). The Hacker Ethic and the Spirit of the Information Age. Random House. ISBN 0-375-50566-0.
  • Ingo, Henrik (2006). Open Life: The Philosophy of Open Source. ISBN 1-84728-611-9.


The bansuri is a transverse flute of South Asia made from a single hollow shaft of bamboo with six or seven finger holes. An ancient musical instrument associated with cowherds and the pastoral tradition, it is intimately linked to the love story of Krishna and Radha and is also depicted in Buddhist paintings from around 100 CE. The Bansuri is revered as Lord Krishna’s divine instrument and is often associated with Krishna’s Rasa lila; mythological accounts tell of the tunes of Krishna’s flute having a spellbinding and enthralling effect not only on the women of the Braj, but even on the animals of the region. The North Indian bansuri, typically about 14 inches in length, was traditionally used as a soprano instrument primarily for accompaniment in lighter compositions including film music. The bass variety (approximately 30″, tonic E3 at A440Hz), pioneered by Pannalal Ghosh has now been indispensable in Hindustani Classical music for well over half a century. Bansuris range in size from less than 12″ to nearly 40″.


Hariprasad Chaurasia playing the Bansuri

Raghunath Prasanna playing tripura Bansuri in a concert

The word bansuri originates in the Sanskrit bans (बाँस) [bamboo] + sur (सुर) [melody]. There are two varieties of bansuri: transverse, and fipple. The fipple flute is usually played in folk music and is held at the lips like a whistle. Because it enables superior control, variations and embellishments, the transverse variety is preferred in Indian classical music.

Pannalal Ghosh (1911–1960) elevated the Bansuri from a “folk” instrument to the stage of what was then called “classical” music.[1] He experimented with the length, bore and number of holes, and found that longer length and larger bore allowed for better coverage of the lower octaves. He eventually pioneered longer bansuris with larger bores and a seventh hole placed a quarter turn inwards from the line of the other six finger holes.

A generation of musicians born in the 20’s, probably inspired by the raise of bansuri playing initiated by Pannalal Ghosh, kept on developing and exploring the possibilities of the flute to render raga music. The work opportunity offered by the radio and the new institutions growing around North India encouraged many musicians to take on the flute to further its technique and styles. Among them were Raghunath Prasanna (c.1920–June 1999), a shehnai and flute player from Varanasi; Prakash Wadhera (1929–2005), a flute player and musical critic who joined the Gandharva Mahavidyalay as a teacher in Delhi; Vijay Raghav Rao (1925–), from Mumbai; and Devendra Murdeshwar (c.1923–2000).


Bansuri construction is a complex art. The bamboo suitable for making a bansuri needs to possess several qualities. It must be thin walled and straight with a uniform circular cross section and long internodes. Being a natural material, it is difficult to find bamboo shafts with all these characteristics, which in turn makes good bansuris rare and expensive. Suitable species of bamboo (such as Pseudostachyum) with these traits are endemic to the forests of Assam and Kerala.[2]

After harvesting a suitable specimen, the bamboo is seasoned to allow naturally present resins to strengthen it. Once ready, a cork stopper is inserted to block one end, next to which the blowing hole is burnt in. The holes must be burnt in with red hot skewers since drilling causes the fibrous bamboo to split along the length, rendering it useless. The approximate positions of the finger holes are calculated by measuring the bamboo shaft’s inner and outer diameters and applying certain formulae. Flute makers have only one chance to burn the holes, and a single mistake ruins the flute, so they usually begin by burning in a small hole, after which they play the note and using a chromatic tuner and a drone called tanpura, gradually make adjustments by sanding the holes in small increments. Once all the holes are perfected, the bansuri is steeped in a solution of antiseptic oils, after which it is cleaned, dried and its ends are bound with silk or nylon threads for both decoration as well as protection against thermal expansion.


Bass Bansuri played with key of E(white three)

Small Bansuri played with key of E(white three)

Carnatic 8-hole Venu flute pitch E

Problems playing these files? See media help.

Indian music is played in 3 octaves—mandra (lower), madhya (middle), and taara (high) — with ornamentations such as meendas (glides) and gamakas (oscillations).

Bansuris range in length from less than 12 inches (called muralis) up to about 40 inches (shankha bansuris). 20-inch bansuris are common. Another common and similar Indian flute played in South India is the venu, which is shorter in length and has 8 finger holes (this type of Indian flute is played by the Carnatic musician Shashank Subramanyam). The index, middle, and ring fingers of both hands are usually used to finger the six-hole bansuri. For the seven-hole bansuri, the little finger (pinky) of the lower hand is usually employed.[3]

fingering chart for a Bansuri

As with other air-reed wind instruments, the sound of a bansuri is generated from resonance of the air column inside it. The length of this column is varied by closing or leaving open, a varying number of holes. Half-holing is employed to play flat or minor notes. The ‘sa’ (on the Indian sargam scale, or equivalent ‘do’ on the octave) note is obtained by covering the first three holes from the blowing-hole. Octaves are varied by manipulating one’s embouchure and controlling the blowing strength. Various grip styles are used by flutists to suit different lengths of Bansuris, the two prominent styles being the Pannalal Ghosh grip, which uses the fingertips to close the holes, and the Hariprasad Chaurasia grip, which uses the pads (flat undersides) of the fingers to close the holes.[4] While playing, the sitting posture is also important in that one should be careful not to strain one’s back over long hours of practice. The size of a Bansuri affects its pitch. Longer bansuris with a larger bore have a lower pitch and the slimmer and shorter ones sound higher.

In order to play the diatonic scale on a bansuri, one needs to find where the notes lie. For example, in a bansuri where Sa or the tonic is always played by closing the first three holes, is equivalent to C, one can play sheet music by creating a finger notation that corresponds to different notes. A flutist is able to perform complex facets of Raga music such as microtonal inflections, ornamentation, and glissando by varying the breath, performing fast and dextrous fingering, and closing/opening the holes with slow, sweeping gestures. These techniques are demonstrated by the famous Indian flautist Pt. Hariprasad Chaurasia.


Tunes as played in Bansuri, Tunes are from folk songs of Nepal

Care and maintenance[edit]

Since the bansuri is a natural woodwind instrument, it is prone to cracks and thermal stresses while playing.

  • Avoid playing in very cold conditions. This causes the bamboo to expand unevenly and develop cracks, because of the warm air blown into it.
  • Frequently oiling the bansuri is recommended as this conditions the bamboo and makes it to last longer. Usually, slight amount of mustard oil is used on the inside of the bansuri. Some bansuri players and makers prefer linseed oil or walnut oil to mustard oil, owing to its strong odour. Oiling must never be done on the threads or near the blowing hole on the inside. A small cotton swab (attached to any convenient piece of stick) soaked in the oil should be applied on the inside, about two inches away from the blowing hole. It must be made sure that the bansuri is cold (i.e., not recently played, because recently played bansuris have moisture on the bore surface) before oiling. After oiling is done, it is allowed to soak completely.
  • The frequency of oiling depends on the climatic conditions in which the bansuri is played. Dry hot climates require oiling as frequent as four to six times a year.
  • If, in case, cracks develop on the bansuri, they will most likely destroy the tuning of the bansuri. To prevent further damage due to cracks, apply instant glue (with lower viscosity, so that it can seep into the crack and bond it) on the crack and then bind the area with threads (nylon threads used in crochet can be used).

Veteran players[edit]

Well-known bansuri players include Pannalal Ghosh (1911–1960), Raghunath Prasanna (c. 1920 – 1999), Vijay Raghav Rao (born 1925), Bholanath Prasanna (1930–1996), Raghunath Seth (1931–2014), Hariprasad Chaurasia (born c. 1938), Nityanand Haldipur (born 1948), Rajendra Prasanna (born 1956), Ronu Majumdar (born 1963), Rupak Kulkarni (born 1968), Pandit Rohit Anand (born 1960), Pravin Godkhindi (born 1973), Sameer Inamdar (born 1987), and Steve Gorn (born 1944)

See also[edit]


  1. Jump up^ “the Legacy of Pandit Pannalal Ghosh”. David Philipson, CalArts School of Music. Archived from the original on 30 June 2007. Retrieved 2007-06-26.
  2. Jump up^ “Bansuri Bamboo Flute”. Brindavan Gurukul.
  3. Jump up^ Leifer, Lyon (2005). How to Play the Bansuri: A Manual for Self-Instruction Based on the Teaching of Devendra Murdeshwar. Rasa Music Co. ISBN 0-9766219-0-8.
  4. Jump up^ “The Right Grip”. Prasad Bhandarkar, Sameer Inamdar

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