Career
His work is extensive and varied, including musical arrangement for theatre and many scores for television and film. In the 1970s he began a long association with Richard O"Brien. Hartley was originally part of the four-piece band for the Rocky Horror Show.
He went on to arrange the score for the London Stage show.
He then went on to provide arrangements for the film adaptation, The Rocky Horror Picture Show (1975) and its follow-up Shock Treatment (1981), and worked with O"Brien on another, as yet unproduced, sequel, Revenge of the Old Queen. His other 1970s film scores included The Romantic Englishwoman (1975), Aces High (1976), and the remake of The Lady Vanishes (1979).
In the 1980s, Hartley worked primarily in television, including providing the music for the 1986 Doctor Who story Mindwarp. However, one of his lesser known works is the music for The Fifth Dimension, a dark ride at Chessington World of Adventures.
Hartley provided music for the British Broadcasting Corporation/Home Box Office film The Life and Death of Peter Sellers in 2004, and most recently wrote the music for the film Flashbacks of a Fool (2008).