 The line-up consisted of Lomax on vocals, Harrison and Eric Clapton on guitars, Nicky Hopkins on piano, Paul McCartney on bass, and Ringo Starr on drums.McCartney was absent from the initial session, however, only returning on 25 June from an Apple-related business trip to California.While Apple projects typically featured one member of the Beatles, "Sour Milk Sea" is the only track where more than two members of the band appeared on another artist's recording.