Originally trained as a doctor, Orr gave up medicine and switched to music in 1952, studying composition at the Guildhall School of Music with Benjamin Frankel and conducting with Aylmer Buesst. Through Frankel's help and influence, Orr became active for a time composing film scores, and his first general recognition as a composer came from the high profile production of Tennessee Williams' Suddenly Last Summer in 1959, starring Elizabeth Taylor and Katharine Hepburn and directed by Sam Spiegel. His one-act opera The Wager, was successfully staged at Sadler’s Wells in 1961. With his return to the Guildhall School of Music as a professor in 1965 Orr soon gained a reputation as an energetic and influential teacher. He founded the Guildhall New Music Ensemble and also conducted the London Jazz Composers’ Orchestra between 1970 and 1980, the latter stimulating his particular interest in improvisation. His pupils included Deirdre Gribbin, Barry Guy, Gary Higginson, Philip Sawyers and Debbie Wiseman. In 1990 Orr gave up regular teaching to devote more time to composition, and lived with his second wife Jean Latimer in the Wye Valley until his death. A new opera, The Alchemist, was in the process of being orchestrated at his death. He was not related to the composer Robin Orr.
Music
Orr's music includes works in all genres, including songs, chamber music, works for brass and wind band, orchestral music, opera and music theatre as well as film scores. His style is notable for its interest in structures that evolve through continuous variation, often with his personal take on 12-tone serialism, using tonal intervals and octave doubling. The three Piano Trios, the orchestral Triptych and the substantial 40 minute orchestral Sinfonia ricercante are representative examples of this style. Several virtuoso instrumental fantasies on famous themes, such as the Carmen Fantasy for cello, deconstruct familiar material to create new compositions. The others in this series are Portrait of the Don, Catfish Row and Tales from Windsor Forest. Elements of jazz are present in some works, particularly those scored for brass band, such as the Caledonian Suite, Tournament for brass tentet and Narration for symphonic wind ensemble. Refrains III, written for the London Jazz Composers' Orchestra, develops Orr's interest in improvisation, even including the conductor as one of the different improvising groups within the total ensemble. It was first broadcast on 6 May 1975 on BBC Radio 3.. During the 1980s Orr composed three music theatre pieces: Unicorn, The Last Circus and Ring in the New, and a number of song cycles, including the "caustic" Ten Types of Hospital Visitor, setting Charles Causley. His early film music included Hammer horror scores such as Corridors of Blood and Dr Blood's Coffin. Some of his stock music was used in several Doctor Who serials in the 1960s. Recordings
