In 1967, he was a founding member of psychedelic pop-progressive rock group James Taylor Move. After the band broke up in 1968, along with fellow member Alan Tarney moved to England and met up with Kevin Peek who had also played with James Taylor Move. The trio formed the Kevin Peek Trio (1968–69). In 1969, Terry Britten moved to England and and the musicians formed the short lived rock band Quartet (2). During the 1970s, Trevor worked as a studio drummer and was a house songwriter for ATV Music. He formed The Tarney/Spencer Band with Alan Tarney in 1976. Later he moved into record production and worked for many major labels as a freelance producer before relocating to Perth, Western Australia. In 1986, he bought the Sh-boom studios located in Perth, in partnership with Gary Taylor (3).