Best rock bass player

Jack Cassidy and Phil Lesh took the rock bass guitar where it never had gone before. Fat humbucking pick-ups on their Guild Starfires was the foundation of the San Francisco sound.
Who ever played bass on Funkadelic's One Nation Under a Groove deserves mention here as we'll.

Who ever played bass on Funkadelic's One Nation Under a Groove deserves mention here as we'll.

I believe that's Bootsy, Baby! (Collins)

Martykl,
I was thinking of the second track, Groovallegiance. The bass player is either Rodney skeet Curtis or Cordell boogie Mosson. Bootsy Collins style was not as harmonic as this bass solo suggests. Anyone who loves the bass owes it to themselves to check out this track as well as Mann's Fate on Hot Tuna's first album. Two of my favorite go to songs as far as the electric bass guitar is concerned.

A lot of good players already listed, let me add Leo Lyons of Tens Years After.

My list (includes funk & soul) …... most already mention but here goes anyway.
James Jamerson.. underpinned the Motown sound. Marvin Gaye sought him out to play on 'What's Going On' .
Paul McCartney … for his melodic lines … listen to I Want You (She's So Heavy) from Abbey Road
Bernard Edwards (Chic) … some of my favourite bass lines Check out "Good Times' Same bass line used on Sugar Hill Gang's 'Rapper's Delight"
Larry Graham … the father of slap.
John Entwistle …. 'Thunderfinger' …influenced many other bassists.
+ many more
Also have to mention Doug Wimbish (Living Colour, Jungle Funk) I had the pleasure of seeing him play live a couple of times … my jaw was on the floor!