Otis, Clayton, Muddy, Charlie Jr. According to Wikipedia, all four, or both, played bass on both of the Wilbury albums. Those pseudonyms belong to Tom Petty and Jeff Lyne. But George Harrison was a Wilbury also! I like to imagine that the three of them took turns playing, both in studio and live. Tom playing one of his vintage short scale basses. Jeff with one of Petty's basses. And George with his Fender Bass VI. Any thoughts?