Mr. P. C. by John Coltranefrom the Giant Steps album of 1959, as heard on WMBR's Coffeetime w/ Angelynn Grant
Man, I hadn't heard this in a long time and man, it's good. The whole band is good. Trane, of course. The song's namesake Paul Chambers on bass, Tommy Flanagan on piano and Art Taylor on the drums. I was listening to this at work, and somehow managed to get stuff done.