I think Tony Levin is the top bass guy. He's also one of the best Chapman Stick players too.

He can play in a very distinctive style all his own or play as a totally unnoticed rhythm section member. Very versatile.

Take a look at the fully expanded "Appears on" list at AMG:

http://www.allmusic.com/cg/amg.dll?p...=R98056#APPEAR

The guy has played on like 400 albums.