Dug Pinnock (Kings X) He has the biggest baddist hard rock metal tone I've ever heard. It sounds like a bass AND two tuned down guitars.
Peter Cetera Chicago (especially Chicago V) That pick tone on a P Bass is warm-round and cuts thru the mix like no other
Will Lee (Live at Manny's Carwash w/Hiram Bullock) The consummate modern pop tone, grindy and round but with some meat when he's slapping.
James Jamerson, I know he gets lost in the mix sometimes, but it's always there and it always supports the band. He was also the first bass player many of us noticed during the late 60's growing up despite the fact we didn't know who he was.
Mark Egan (with Pat Metheny group) The best Frettless sound ever, it sounds like a frettless with all the nuances that are available on a frettless but with a fatness that is lacking in many frettless players sound.
Rustee Allen (If you want me to stay-Sly) the consummate example of the 70's J bass sound later built on by Verdine White and others. Not to be confused with the J bass on Steroids sound of Marcus Miller. These basses had a cool mid-range bark
Chris Squire (Yes) The forerunner of modern metal tone. A grindy driving sound that propelled the song along.
Barry Oakley (Allman Brothers) Probably the prototype P-Bass rock sound for years to come.