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In page Ruth Watson Henderson:

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Born Ruth Louise Watson in Toronto, Watson Henderson studied the piano with Viggo Kihl from 1937 to 1945. She then entered The Royal Conservatory of Music where she studied from 1945 to 1952 and earned an associates diploma in 1949 and a licentiate diploma in 1951.[citation needed] Her piano teacher there was Alberto Guerrero. She also studied composition privately with Oskar Morawetz, Samuel Dolin and Richard Johnston. From 1952 to 1954 she studied piano at the Mannes College of Music in New York City with Hans Neumann (pianist).[1]