"Tomorrow Tomorrow" is a song by the Bee Gees and was originally intended for singer Joe Cocker. It is the first Bee Gees single released after Robin Gibb had quit the group which was now down to a trio featuring Barry Gibb, Maurice Gibb, and Colin Petersen on drums. Released in the United States on 1 June 1969, the single charted only reached No. 54 on Billboard, but cracked the Top 40 on Cashbox, reaching No. 32. The B-Side is the notably acclaimed, Sun in My Morning, an often mentioned song citing its melodic haunting harmonies and guitar work. This song was recorded in 19 and 21 March in that year, its B-side "Sun In My Morning" and the unreleased song "Ping Pong" was finished to record in 19 March. Its promotional video for this song is very rare; they are in a park with Barry and Maurice playing guitar and Colin playing the drums.