The sruti upanga ("drone bagpipe", or bhazana-Ã Âruti, druthi, or nosbug) is a type of bagpipe played in Tamil Nadu, southern India. The instrument was often used to supply a drone to accompany mukha vina (Tamil oboe) music.
The instrument was described by Charles Russel Day (1860-1900):
Beatrice Edgerly notes in 1942, similar to Day, that the pitch of the instrument was controlled by inserting wire or bits of silk.