After serving as road manager, Dave Mason, singer/guitarist played in a band that opened for the Spencer Davis Group. The drummer of the was Jim Capaldi. After an American tour, Capaldi and Mason joined forces with Steve Winwood (from Spencer Davis) and Chris Wood (form Shades of Blue) who found fame as one of the founding members of the jazz/rock/pop fusion group Traffic.
However, conflicts between Winwood and Mason over the group's direction led to the latter's departure in 1969 after three albums. Mason moved to Los Angeles and joined Delaney & Bonnie & Friends. Opening for Blind Faith (which featured Winwood and Eric Clapton), Clapton joined Delaney and Bonnie. After a few months and Clapton's solo album, Eric and Mason stole the Delaney and Bonnie rhythm section, bassis Carl Radell, drummer Jim Gordon and piano player Bobby Whitlaock to form Derek and the Dominoes. Dave left shortly thereafter, and signed to Blue Thumb, beginning his solo career. His 1970 solo debut, Alone Together, with Jim Gordon featured on drums, went Gold and is, arguably, his best album . He followed up with a duet album with (Mama) Cass Elliot.
Mason's tenure with Traffic was disjointed. He co-founded the group, but left following the recording of their debut album, Mr. Fantasy (1967), only to rejoin halfway through the sessions for their next album, Traffic (1968), after which the band broke up. Last Exit (1969), a compilation of odds and ends, features little material by Mason apart from his song Just For You. Traffic would later reform without Mason, although he briefly toured with the band in 1971 as captured on Welcome to the Canteen.