male picks:
Roy Orbison: you wanna talk about range?!
David Clayton Thomas (Blood, Sweat, and Tears): pipes! My gawd, such pipes!

male pans:
Geddy Lee (Rush): he sounds like he spent his childhood in a high-helium environment.
Bruce Springsteen: a fitting heir to Bob Dylan, another brilliant poet who couldn't carry a tune if you put a handle on it.

female picks:
Sarah Vaughn: her voice kinda curls up in your ears and makes you feel warm all over; you gotta hear her to believe it!
Janis Joplin: I don't like people who scream their lyrics, but this woman made us all feel her pain.

female pans:
Marlo Timmins (Cowboy Junkies): she threatens a lot of notes, but never actually hits any!
Mariah Carey: all t(h)rilling technique, and no soul at all.