Their brand of music was a typical late 1960s blend of rock, which they often fused with psychedelic effects such as phasers and vocoders, or classical arrangements.

[3] In addition to Lennon, Paul McCartney and Ringo Starr of the Beatles, Brian Jones of the Rolling Stones, Donovan, and Cilla Black attended the press launch and were photographed with the band.

[4] For a third single, Grapefruit submitted several other new songs, and a cover of The Four Seasons' "C'mon Marianne" was remixed (at RCA's request) by Derek Lawrence and reached number 35.

[4] Terry Melcher then resumed producing Grapefruit, including re-mixing or re-recording earlier songs (for which Apple was willing to supply the tapes), but the Lennon-McCartney version of "Lullaby" was still not released.

Grapefruit broke up in late 1969, although Pete Swettenham had left the group earlier in the year and been replaced by Bob Wale on the second album.

Toward the end of their career, following the new material being written by Alexander (with some inclusions by Wale), Grapefruit shifted from melodic pop to more of a rock-based sound, referred to as soft rock in a full-page Billboard advertisement for their second album, Deep Water.

[6] His production includes singles for Driftwood, The Playground, Jimmy Cassidy, Liverpool Express, John Le Mesurier, Pavement, The Cats and others.