He entered the music business as a performer in 1966, and as a duo with Douglas MacRae-Brown released The Young Idea LP in 1967,[1] and had a UK top ten hit single with a cover version of the Lennon-McCartney song "With a Little Help from My Friends".
He continued performing in the studio with various acts he produced such as Trees[3] and Mick Softley.
[9] In 1978 he married the singer-songwriter Lesley Duncan,[10] and produced her single "The Magic's Fine".
[12] From 1988 to 1990 he worked for Andrew Lloyd Webber's Really Useful Group as music supervisor, overseeing various shows.
[12] Recently Cox has been composing 'Protomodal' music for instrumental ensemble, creating a uniquely distinctive sound by utilizing unusual modal scales and unorthodox harmonies, mixing rigid composition rules with John Cage like chance elements.