It's hard to play/listen to the piano on Graal with PM noises interfering. I love this idea! I personally believe sounds should have its own category. Messages, music (in game soundtrack), sound effects (bombs, bushes, mounts), instruments (piano, flute), anything else I'm forgetting? Something amongst those lines. I don't believe it's 100% necessary, but it would be a huge convenience to players who only have their sounds on for certain things.