I've been a Beatles freak for so long, I sometimes forget what is common knowledge and what is known too by casual-ish fans.
Are you guys familiar with the Hamburg-era Beatles friend Klaus Voormann who wound up playing bass on much of John, George, and Ringo's early solo stuff? I'm pretty sure we've talked about him here. . I think I mentioned one time that he probably had as much influence on my playing as Macca. Probably true about Leon Wilkerson, John Woloshuk (Klaatu), and Dee Murray as well.
Voorman is an interesting artist--he did the covers for Revolver and much later, the Anthology series albums. He's a super modest guy and one of the greatest and most under-appreciated bassists of the 60s and 70s.
Perhaps his greatest non-Beatle moment is those opening bass riffs on Carly Simon's "Your So Vain" which is a fun song for a bassist to play.