Great Organists in Rock

Bill Payne - Little Feat
Reese Wynans - SRV
Jimmy Greenspoon - Three Dog Night

Hammond B3 is THE organ of merit.
No EJ jokes! Not mouth organ nor even skin flute.
Grow up, people!

chuck leavell he's got to be on the list. He's played with everybody.

All Hammond players - but then I am biased

Jean-Jacques Kravetz (Frumpy / solo)
Jeff Beer (Odin)
John Tout (Renaissance)
Vincent Crane (Atomic Rooster / Crazy World of Arthur Brown)
Paolo "Apollo" Negri (Wicked Minds / Link Quartet / solo)
Par Lindh
Pete Robinson (Quatermass)
Thomas Bodin (Flower Kings)
Mike Mangan (Big Organ Trio)
John Freund (Bigger Than a Breadbox)
John Novello (Niacin)
Graham Field (Fields / Rare Bird)
Julian Jay Savarin (Solo / Julian's Treatment)
Fred Hellman (Kvartetten Som Sprängde)
Gianluca Gerlini (London Underground)
Eric Malmberg (solo)
Gerald Dellmann (Satin Whale)
Oskar Lundström (Siena Root)
Tillbjörn Persson (Sound Express)
Terry Howells (Still Life)
Rick van der Linden (Trace / Ekseption)
Fred Van Zegveld (solo)

These all have shown to have superb skill either over the course of a career of perhaps on a single album.

Also see my list on RYM (if anyone's remotely interested)
http://rateyourmusic.com/list/Crazyworldof/hammond_fest

Richard Wright for Pink Floyd was the first keyboardist that came to mind - I dont know what type he played, but as far as contributing to a bands sound, I cant think of any other bands where the keyboards worked so well and didn't make it sound like funk-a-delic or the capton and tanell (SP) or something.

Billy Powell from Lyndard Skynard was great too at helping the bands sound and it still sounded like hard rock and not something light weight like elton john or barry manalow.

Generally, i hate keyboards in rock bands, but these are two examples where, imo, they worked very well.