Norman Granz' Jam Session

On album # 1, Norman Granz wrote in the liner notes: "This is Album # 1 of a series of two which I'm releasing under the descriptive title of 'Jam Session'." Nine numbered albums are known to be issued under this series/title as "Jam Session" or "Norman Granz' Jam Session," initially on Mercury, then Clef Records, and later issued on Verve Records.