You cannot have a 'Greatest Bass Players of All Time' list without Steve Harris from Iron Maiden. Because of the type of music, I know alot of people either have never heard of him or his music, but dude is a genius. He plays the bass like a lead guitar and he doesn't use a pick. Totally plucks the strings with his fingers only. Any bass player that uses a pick is not really a bass player.
Jaco Pastorius, Charles Mingus, Jack Bruce, Jon Entwistle, Paul Chambers... man I could go on and on, but that's just the musician in me. Oh and how could I forget Stanley Clark. Dang.
Ah, Jaco. If he's good enough for ole Joni Mitchell, then..... "He died in 1987 from a physical beating sustained from a doorman while trying to gain entry into the Midnight Club in Fort Lauderdale at age 35."