If you want a music-related costume, a fairly low-effort one would be to be a Blues Brother. You just need a suit, hat, sunglasses, half a pack of cigarettes, and your name written on your knuckles. When people ask who you are, you say, "I'm on a mission from God." One of these years I'll do that...

This year I'm going as an artist (concept directly ripped off from my niece); last year I was Anne of Hell (Anne of Green Gables look with devil horns).

Marion