Unheralded Sideman

There's a story from the first US tour of the original Jeff Beck Group that after a performance in Central Park's Wollman Skating Ring a PR type from the record label ran up to the group's vocalist, Rod Stewart, and said, "Great show Jeff, and your band has a really good guitarist too!" So much for the intelligence of PR reps, but there are occasions where I think the sidemen musicians are at least as interesting, if not more interesting, than the star performers. Some of my favorite sidemen are:

James Jamerson - bass, Motown house band
Jack Ashford - tambourine, Motown house band
Charlie Watts - drums, Rolling Stones
Jack Cassady - bass, Jefferson Airplane/Hot Tuna
Bruce Thomas - bass, EC & the Attraction

Anybody eles have their favorite sidemen?