A male soprano, he was especially active in the late 1960s and the 1970s as a backing vocalist for rock artists seeking to achieve a more polished vocal performance on their recordings.
[1] As a songwriter during that time, he frequently collaborated with Billy Preston, co-writing the latter's Grammy-winning 1972 hit "Outa-Space" and other songs.
[2] Among the many artists whose recordings Greene appeared on are Quincy Jones, the Rolling Stones, Neil Diamond, Ringo Starr[1] and Harry Nilsson.
[4] Greene co-wrote the song "Let the Music Play" on Preston's 1970 album for Apple Records, Encouraging Words.
[7] In the ensuing decades, Greene withdrew from rock music and focused on gospel and choral projects.