Steve, Chet Baker was the original trumpet man with Mulligan, then if my memory serves me right, Art Farmer took over and then valve trombonist Bob Brookmeyer , (this was the only time I caught the Mulligan Quartet live) , then it was trumpet man John Eardley. Mulligan then of course formed his Jazz Orchestra which was also excellent, and also Mulligan later joined forces with the Dave Brubeck Quartet (Live At The Berlin Philharmonic is a cracker) .