listen to the album "SMPTE" by the band "Transatlantic". You will be blown away.
It's a supergroup with Pete Trevawas (from Marillion) on bass, Mike Portnoy (from Dream Theater) on drums, Roine Stolt (from The Flower Kings) on guitar, and Neal Morse (from Spock's Beard) on keys & vocals.
Pete Trevawas *always* has great bass lines going on.. check any Marillion album released from 1983 to 1989. (Script for a Jester's Tear, Fugazi, Misplaced Childhood, Clutching at Straws, Season's End). Every Marillion song from that era had great bass. Every single one. I'm telling you, Pete Trevawas is the most under appreciated bass player walking the face of the earth.
Billy Sheehan was originally in a band called Talas. They released two albums in the 80's and then broke up. I think Billy Sheehan was the only consistent member on those two albums...the entire band is different on the 2nd album except for Billy. Many years later a third album was made with the original members. As I recall, the first album was called "Sink Your Teeth Into That" and the second was called "Live Speed on Ice". I have a CD that combines both of those albums onto one disc called "Billy Sheehan: The Talas Years". The 3rd album was called "If We Only Knew Then What We Know Now".
Now go get some of Pete Trevawas' work!