Crispian St Peters was born Robin Peter Smith in Swanley, Kent.
After his National Service, he formed a band called The Beat Formula Three and met manager David Nicholson, who gave him his new name and scored him a recording contract with Decca (the group was dumped and replaced by The Puppets).
His first single, At This Moment (1965), was a monumental failure, as was the follow-up, No No No.
Nicholson persuaded St Peters to cover a song by American folk group, We Five, called You Were On My Mind. The singer was initially not taken by the tune and had to be convinced to record it by his mother.
The single was released at the end of 1965 and hit the charts early in 1966, peaking at #2 in the UK and also reaching the US Top 10.
St Peters was plagued with illness for most of his life. He passed away in June 2010 (aged 71).