Rabinowitz was born in Johannesburg in 1916, and moved to England in 1946 to study at London's Guildhall School of Music and Drama.
He served as head of music at BBC TV Light Entertainment in the 1960s, and as head of music services at London Weekend Television in the 1970s. In 1977 he was awarded a national honor, the MBE.
He composed scores for many TV shows including "Reilly: Ace of Spies," for which he received a BAFTA nomination in 1984.
Rabinowitz worked as a conductor on several films with British director Anthony Minghella, including "The English Patient," "The Talented Mr. Ripley" and "Cold Mountain." He also worked on many Merchant Ivory pictures, including James Ivory's "The Remains of the Day" and "Howards End." Other Ivory pics he worked on included "A Soldier's Daughter Never Cries," starring Kris Kristofferson, "The Divorce," starring Kate Hudson, and "The Golden Bowl," starring Uma Thurman.
Hollywood credits included "Message in a Bottle," with Kevin Costner, and "City of Angels" with Nicolas Cage and Meg Ryan. He also worked on Roman Polanski's "Death and the Maiden."
Rabinowitz died at his house in France, his family said.