Ah the Rickenbacker 4001, there's simply nothing like it, like all Rickenbacker instruments, it's an entity of its own, very polarizing in both its looks and sound and even in this day and age people are still discovering its charms. So let's name the recordings on which it is featured. First up and did you expect anybody else? Let's be honest, it was Paul who cemented the Rickenbacker 4001's reputation as a serious workhorse bass. He started using his example on the "Rubber soul" sessions where he made very good use of the fact that it stayed in tune better than his old Hofner, which enabled him to grow as a player. In the "Canteen" website about the Beatles' instruments it was revealed that when Paul's bass was sent to the Rickenbacker factory to get a refit, that only the neck pickup was working, which explains the tones he got on songs like "Penny lane" and "Hey Bulldog" so a new bridge pickup was fitted and the tone of which is so eloquently displayed on this song. Now say "Rickenbacker bass" and people will go "Prog rock" and indeed, every major Prog rock band seemed to have their bass player using a Rickenbacker some time or another, all of them making good use of the example that Paul McCartney made with the instrument's deep tone and twang on the high notes. It resulted in a word to describe that tone: "Clank" And if there's one guy who forever got the word "Clank" associated with his tone, it must be THIS guy. Just hear Chris Squire driving that concrete mixer sound of his Rick-bass through guitar amps to really get that grind going. One player who took note of what Chris Squire was doing was THIS prog rock legend. Geddy Lee Using his Rickenbacker twin neck to very good use. But the punk bands also discovered the Rick-bass and found its snarling clank perfectly suited for the music they made.