He was born in High Wycombe and attended the Royal Grammar School there, from where he won a scholarship to read modern languages at Jesus College, Oxford in 1940. From 1942 to 1946, he served as a cryptanalyst in India and Burma. After war he returned to Oxford to complete his degree. From 1949 to 1954, he was a producer at the BBC Third Programme.
Stevens completed the task of producing the Supplementary Volume to the 5th edition of Grove's Dictionary of Music and Musicians, which Eric Blom had not been able to complete by the time of his death in 1959. The Supplementary Volume was published in 1961. He also contributed to The Stereo Record Guide through 1968.
From 1964 to 1976 he was professor of musicology at Columbia University, New York. In 1995 he was appointed as visiting professor at Goldsmiths College, London, the institution which now houses his extensive Monteverdi library.
He was appointed a Commander of the Order of the British Empire (CBE) in 1984.
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