I can't separate voice from songwriting, playing, etc. The vocalist thing really throws me because I don't listen to, say, Blondie for Debbie's Harry's voice, so is she one of my favo(u)rite vocalists? Whitney Houston is better technically but I hate her music. Laura Ballance plays bass in Superchunk and never sings but they are one of my favo(u)rite bands. I don't even know the names of anyone in L7 but I love them. Tegan and Sara are a duet; so are Carrie Brownstein and Corrin Tucker. How do I pick between the two? This is so narrow and specific I would guess I'm only going to submit a few names, and basically that means solo artists or band leaders.