Paul Chambers; was one of the premier bassists in jazz history.  Classically trained, he joined Miles Davis' quintet at age 20 in 1955 and stayed until 1963.  In addition to Kind of Blue, he played on several landmark albums including Coltrane's Giant Steps, Monk's Brilliant Corners, and Oliver Nelson's The Blue and the Abstract Truth.  He also made several albums as leader fo Blue Note.
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