Sruti upanga: India musical instrument

The sruti upanga is a kind of bagpipe instrument that is played in tamil nadu, southern part of India. The musical instrument was oftenused to supply a drone to accompany melody.

source of picture: en.wikipedia.org

Beatrice Edgerly notes in the year 1942, an analogous musical instrument to Day, that the pitch of the musical instrument was regulated by inserting wire or bits of silk.