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It was not until the play's third incarnation in 1976 at the Shaw Theatre in London directed by Paul Giovanni that Shaffer was satisfied with it.
Aside from composing original scores for Film, Mitchell has scored music for Theatre Productions and Live Events which include the Opening Ceremony for Euro '96 at Wembley Stadium. He was commissioned to write the score for one-man theatre show Ousama with Nadim Sawalha directed by Corin Redgrave at the Brixton Shaw Theatre, and a jazz suite for the Francis Bacon Retrospective Exhibition at the Tate Britain in 2008.