Ok here we go:
Vocals:Robert Plant, Jim Morrison, Freddie
Guitarist:Hendrix, Steve Vai, Clapton, Knopler
Bass:Dont care as long as its there
Drummer:Mitch Mitchell, Ginger Baker

Vocals : Vince Neil
Drummer : Tommy Lee (best ever)
Guitar : Slash
Bass : Geddy Lee

Vocal: Ian Gillan

Guitar: Steve Howe & Ritchie Blackmore

Bass: Chris Squire

Drummer: Cozy Powell, Ian Paice, Neil Peart
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KEYBOARDS: Jon Lord, Keith Emerson & Rick Wakeman

ok- this is pretty hard because there are so many great musicians that just don't play in the rock/metal genre, but i'll try my best

lead guitar- probably eddie van halen, jimmy page wouldn't be bad either

rythem guitar- angus young, probably

drums- neil pearte, no question

bass- robert trujillo, i dunno though

vocals- well, i think eddie veder is good but i dont know if he could sing with these other guys, ummmmmm axl rose might do ok, brian johnson, maybe- also nine inch nails singer is kinda cool, cant remember his name right now oh well

i also would probably have danny elfman write the music all though im not sure if he could right for metal or not anyway yeah tell me what u think of these guys

singer:james hetfield
guitar:steve vai,eddie van halen
bass:billy sheehan
drummer:neil peart

vocal:Adam Lazzara
guitar:Frank Iero
bass:tied between Mike Dirnt & Mikey Way
drummer:Tre` Cool

By The Way What Is With All You F*cking Freddie Mercury Fans?!?!?!?!?!?!

i agree completely with first guy
good list, good musiciens!!
rock on

Thought I'd add my own preferences...I'm going to get slated for it but i don't care...ah !***!! here goes...

Vocalist: Bruce Dickinson
Guitarists: Dimebag Darrell, Matthew Heafy (don't shoot me)
Bassist: Justin Chancellor
Drums: Mike Portnoy

Interesting band huh...mentions also to Danny Carey, Jimmy Page, Freddie Mercury, John Bonham and every other amazing musician I've missed out.

Peace out xox