These sets, performed with recording in mind, were new ground for jazz musician Miles Davis, who had never previously been recorded live in a club with his combo. Material from the four sets was first released in 1961 by Columbia Records on two albums, titled In Person Friday Night at the Blackhawk and In Person Saturday Night at the Blackhawk (Vol.2). Although those albums were subsequently re-rereleased several times, the complete sets were not commercially available until Sony Records released a 4 CD collection using the original master tapes for both events. Not Now Music has the 2 original albums across 2 CDs. The personnel include bassist Paul Chambers who was the one constant in Miles' band from 1955 to 1960. The atmosphere captured at this small San Francisco jazz club brings to life one of the great exponents of many styles such as bebop, cool jazz, hard bop, modal jazz, and jazz fusion. The highly informative liner notes are by John Voysey and this attractively packaged set is a great addition to the existing Miles Davis CDs available on the Not Now Music label.