One of my all-time favorite albums and one which should absolutely be in your music collection! Miles and the band (featuring Paul Chambers on bass) is revolutionary. The compositions, the interplay, the improvisations and the classic bass melody on "So What" is a blueprint for anyone striving to make an album with integrity (hard to believe this was recorded in 1959). Many things to comment on here, but my goal was to keep these comments brief. If you would like to learn more about the inter-workings and insight into this album, there is an excellent book by Ashley Kahn titled, "Kind Of Blue: The making of Kind of the Miles Davis Masterpiece".