At Kaleidophon, Delia helped create the ghost voice and electronic music sequences[1] for Tony Richardson’s production of Hamlet at the Chalk Farm Round House,[2] which was then turned into the 1969 film "Shakespeare's Hamlet".[3]
Delia's sounds accompany the apparitions of the ghost of Hamlet's father and feature Nicol Williamson’s treated voice as the voice of the ghost.[4]
The only other music in the film are a couple of brief trumpet fanfares, for which Patrick Gowers gets the entire film credit as the composer of its original music.