I think you will find that apart from bad Goan cover bands, it's very difficult finding good ORIGINAL music in N Goa. There are a few singers (covers songs) which i thought average at best.
Panjim is your best bet. Last year I missed Zakkir Hussein and Jean Luc Ponty.
You will get some music at Ingo market and Mackies (will they still be on?). saw a good Sitar/Tabla dup there last year.
I know there is a small arts centre in Calangute that puts on Indian Classical now and then (Flute/Sitar/Tabla).
If you are buying CDs dont bother with the cheap pirates, there's a great CD shop in Panjim (Sinaris) bought loads of Indian Classical and Electronica, the real Cds for £3.50 each. Some of which you cant get here... Zakkir Hussein Cds that cost £15 + here!
PS I really like Ban De G' nice stuff. Nicely chilled.