Ron Grainer (11 August 1922-21 February 1981) was an Australian composer who worked for the BBC in 1963. Most notably he wrote the Doctor Who theme/score, which Delia Derbyshire went on to perform. He has been credited in every Doctor Who episode in the original and new series except for the 1996 television movie.
He is still constantly credited for "original theme" in Doctor Who after his death.
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