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Other West End credits included "Robert and Elizabeth" (Lyric Theatre, 1964), "The Great Waltz" and "Billy" (both at the Theatre Royal, Drury Lane, 1970 and 1974), "Bar Mitzvah Boy" (Her Majesty's Theatre, 1978) and "Oklahoma!" (Palace Theatre, 1980). His original London cast recordings include "Summer Song" (1956), "Irma La Douce" (1958), "Robert and Elizabeth" (1964), "The Great Waltz" (1970), "Bordello" (1974), "Bar Mitzvah Boy" (1978), and "Charlie and Algernon" (1979). Faris also conducted for the London Symphony Orchestra, among other orchestras. He orchestrated music for Luciano Pavarotti, including Leoncavallo's "Mattinata" for Pavarotti's recording in 1976. He composed the film scores for "The Quare Fellow" (1962), "He Who Rides a Tiger" (1965) and "Georgy Girl" (1966). He also wrote a scholarly Offenbach biography (1980) and a memoir, "Da Capo Al Fine: A Life in Music" (2009). The former "remains one of the most important" Offenbach biographies.