Progression is a jazz tune originally performed by the Lennie Tristano Quintet with Lee Konitz on alto sax. It was recorded in New York on January 11, 1949 and released in December 1950 as Progression / Retrospection on the New Jazz label, a shellac 10 inch 78 RPM record. The A side Progression is credited to Konitz, while the B side Retrospection is by Lennie Tristano, with Arnold Fishkin on bass, Shelly Manne on drums, Billy Bauer on guitar, and Lennie Tristano on piano, and the piece is associated with cool jazz. In 2012 Lee Konitz released Progression again on the Jazz Conversations album, released December 12, 2012 on VintageVibe Records, with the track running about 3 minutes and classified as Jazz/Blues. Availability may vary by country.