Al Kooper and Mike Bloomfield had previously worked together on the sessions for the ground-breaking classic Highway 61 Revisited by Bob Dylan, as well as playing in support of his controversial appearance at the Newport Folk Festival in July 1965. Kooper had recently left Blood, Sweat & Tears after recording with them on their debut album, and was now working as an A&R man for Columbia. Bloomfield was about to leave Electric Flag, and at relative loose ends. Read more on Last.fm