A pivotal moment in the development of heavy rock, Cream's 1967 album saw them transformed from blues-based revivalists to psychedelic rock heroes. Ginger Baker, Jack Bruce, and Eric Clapton are interviewed in the studio for a track by track analysis. Each of them play acoustically, including Bruce on the piano, and some archival footage is presented. Lyricist Peter Brown discusses the creative process for 'Sunshine Of Your Love'. (BBC Two)