I think I’ll go with the mix and match choice (so much to choose from!)
Vocals -
Kurt Cobain (Nirvana; i’m suprised no one’s picked him yet)
Gibby Haynes (Butthole Surfers; surrealy beautiful)
Glenn Danzig (Misfits, Danzig; hardcore, yet…smooth.)
Micheal Gerald (Killdozer; roar)
Shannon Selberg (Cows, Heroine Sheiks; must write the lyrics)
Black Francis (Pixies; yeah, lyrics too)
oh, and Iggy Pop
Guitar (in general) -
John Frusciante (RHCP; funktastic)
Jimmy Page (Led Zep; that is all)
Paul Leary (Butthole Surfers, again; original, original, scary)
Link Wray (…; the king of surf)
and just for the hell of it:
Kim Thayle (Soundgarden)
Jimi Hendrix
and Buckethead, as long as he stays out of the buttrocky stuff
Bass -
Flea (RHCP; like I said, funktastic)
Les Claypool (Primus; bippity boppity bop)
Kevin Rutamanis (Cows, Melvins; freaky noisy rock)
what, that’s it? christ. Well howz about:
Eric Fontaine
**Drums - **
Dale Crover (Melvins; holy hell, incredible)
John Bonham (Led Zep; holy hell, increddddible)
Hmm, I need to touch up on my drummers here; should I put these guys? at least the second one?
Chad Smith (RHCP)
Dave Grohl (Nirvana)
Well I guess that’s about it…
i am going to limit this to the living, so it could happen!
steve howe, chris cornell, geddy lee, rick wakeman, neil peart, neil young, dave grohl, margo timmons, cheri knight
they can all play or do whatever they want!
D_Odds and gatopescado , I suspect we have a lot of records in common. 
OK, my two contributions…
Guitar: Steve Howe
Bass: Tony Levin
Keysboards: Patrick Moraz
Drums: Neal Peart
Vocals: Enya
Basic 70’s progressive rock band, with some celtic influences. My second band is a little different:
Drums: Doesn’t really matter who, but 2 drummers doing the Burundi-influenced thing (think Adam and the Ants or Bow-Wow-Wow)
Guitar: Joe Satriani
Horns: Tower of Power
Vocals: Barry White
toss in a generic Rhythm Guitar and Bassist, and see what happens.
Boy, is this a thread that can acheive no consensus!
Vox: Daryl Hall (I know…I know…but the guy had blue-eyed soul down pat.)
Electric Guitar: Scotty Moore, I suppose.
Acoustic Guitar: Robin Bullock (Trust me, he can play.)
Bass Guitar: Geddy Lee
Drums: Fred LeBlanc (Not the most technically proficient player. But he gets a mean groove going.)
Mic: Chuck D (Public Enemy)
Vocals: Sting (Police), but only if he puts some cajones in his vocals, like he used to on the first 2 Police albums
Drums: Stewart Copeland (Police, Oysterhead, others)
Percussion/programming/Organ: Money Mark (Beastie Boys)
Bass: Les Claypool (Primus, Oysterhead, others)
2nd Bass: Bootsy Collins (P-Funk, Rubber Band)
3rd Bass: Flea (RHCP)
Moog Synth: Harry Connick Jr.(trust me, he plays a mean analog funk-type synth)
Turntable: Mixmaster Mike
Vocals: Peter Gabriel
Lead Guitar: Steve Morse and/or Phil Keaggy and/or Mark Knopfler
Rhythm Guitar: Keith Richards
Bass: Chris Squire
Drums: Neil Peart, or the guy in the Dave Matthews Band whose name I can’t recall right now, or the Indian guy who used to do some drumming for Bowie.
Keyboards: Keith Green (Good call, Cardinal!) or Elton John
Fiddle (I love fiddles): Mark O’Connor
Band name: The Band Too Good To Exist.
There’s so much talent out there it’s hard to pick. I can’t stand leaving out Mick Fleetwood and Clapton and Ginger Baker and Hendrix and Steve Howe and Geddy Lee and Lennon and McCartney and Stewart Copeland and <Pow! RiverRunner’s head explodes>
And that’s just in the rock and roll realm.
Vocals: Andy Partridge and Colin Moulding
Guitar: David Gregory
Bass Guitar: Colin Moulding
Drums: Terry Chambers
Kazoo: Morrissey
Backup Vocals: All of the artists from “We are the World”