Yeah, that whole music language thing was made back to aid the oral tradition of passing down music. It's called "bols", I believe.
Oh, and don't forget the Harmonium, Pakhawaj, Santoor, Sargam, Sarod, Shehnai, and Tanpura (gotta love the Tanpura).
If you thing the Sarangi is the most sensitive instrument, check out the Chinese Erhu.
