In 1963 Crowson travelled to Cape Town as an examiner for the Associated Board of the Royal Schools of Music and lectured at the South African College of Music at the University of Cape Town from 1965 to 1968.
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He was appointed a music professor at UCT in 1980 from which he received an honorary doctorate in 1996.
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Crowson also gave the first performance of Peter Racine Fricker's Twelve Studies, in Cheltenham in 1961 and the composer dedicated the work to him.
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