Question: What category of music instrument is Vidushi Shashikala Dani the only All India Radio an exponent of?

Context paragraphs:
Vielle à roue et à manche: The vielle à roue et à manche (called dulcigurdy by some luthiers) is a modern term for an early music instrument, of unknown original name, of the hurdy-gurdy family, but distinct in that the notes were changed by fingering the neck rather than pressing tangent keys.  The instrument has several strings which are constantly bowed by a spinning wheel turned by a crank, producing unbroken musical notes.

Carolina Eyck: Carolina Eyck born on December 26, 1987, is a German musician specialising in playing the Theremin, an electronic instrument.  Her performances around the world have helped to promote the unusual music instrument.

Pena (musical instrument): The Pena, also known as "Bana", "Bena" or "Tingtelia", is a mono string instrument falling in the lute category, similar to some of the traditional Indian stringed musical instruments such as Ravanahatha, "Ubo" or the "Kenda", found in various parts of the country.  It is the traditional music instrument of the Meitei community of Manipur, India and some parts of Bangladesh and is played either solo or in group, in folk music or as the accompanying musical instrument for Lai Haraoba festivals.  Pena playing is becoming a dying art as only 145 active Pena players are reported in Manipur.  The Center for Research on Traditional and Indigenous Art (Laihui), an organization headed by renowned Pena player, Khangembam Mangi Singh, has mandated vision to revive Pena music.

Musical Instrument Factory of Riga: Musical Instrument Factory of Riga (Latvian: "Rīgas mūzikas instrumentu fabrika" — "LMIF") was the largest Soviet electronic music instrument manufacturer.  It was based in Riga (former USSR, now Latvia).  RMIF synthesizers became very popular among rock and pop bands in Eastern Bloc.  The plant also produced drum kits.  After the dissolution of the USSR in 1991 RMIF went bankrupt.

Gumrah (1963 film): Gumrah (Hindi: गुमराह , English: "Astray" ) is a 1963 Hindi film produced and directed by B. R. Chopra.  The film stars Sunil Dutt, Ashok Kumar, Mala Sinha, Nirupa Roy, Deven Verma and Shashikala.  The music was composed by Ravi while the lyrics were by Sahir Ludhianvi.  It was remade in Malayalam as "Vivahita" (1970), starring Padmini, Prem Nazir and Satyan.  It was also a hit.  It is really surprising that while Shashikala got Filmfare's award in 'Best Supporting Actress Category', Mala Sinha was totally ignored by Film Fare although her role was equally tough and difficult and she gave her one hundred percent share.

Jal tarang: The jal tarang (Hindi: जल तरंग, Urdu: ‎ , ] ), Tamil: ஜலதரங்கம் , jaltarang, jal-tarang, jal-yantra, jalatarangam or jalatharangam is an Indian melodic percussion instrument.  It consists of a set of ceramic or metal bowls tuned with water.  The bowls are played by striking the edge with beaters, one in each hand.

Shashikala Dani: Vidushi Shashikala Dani (Kannada: ಶಶಿಕಲಾ ದಾನಿ, ""  |Hindi: शशिकला दानी, "Shashikalā Dāni"  ) is an Indian Hindustani Classical Multi-Instrumentalist.  She is one of the few artists and presently the only All India Radio graded female exponent of a unique Indian instrument, Jaltarang (Kannada: ಜಲ ತರಂಗ, ""  |Hindi: जल तरंग, ""  ).

Gagar: Gagar (Punjabi: ਗਾਗਰ , pronounced: gāger), a metal pitcher used to store water in earlier days, is also used as a musical instrument in number of Punjabi folk songs and dances.  It is played with both hands with rings worn in fingers.  It is closely associated with the other music instrument, Gharha, which is an earthen pitcher.

Československé hudební nástroje: Československé hudební nástroje, oborový podník (Czechoslovak Musical Instruments, specialized business) was — during the era of communist Czechoslovakia from 1948 to 1992 — a state owned music instrument manufacturing company headquartered in Hradec Králové.  The company name was later amended — "Československé hudební nástroje, státní podník" — to reflect ownership by the government.  In the 1970s, 50% of its musical instrument export products were supplied to the Soviet Union.

Cycleonium: "The cycleonium is a computer based music instrument.  Every day objects like a bicycle and a bottle, and also a propeller are put in a new context and form the base of the sound design.  They lose their conventional function consequently and have to be considered as indispensable parameters of this instrument."  It was developed by Daniel Dominguez Teruel from 2007–2009 and built with the support of Chiron-Werke GmbH & Co.  KG.

Supporting paragraphs: Shashikala Dani Jal tarang
Answer: percussion