The ensemble performed not only the standard string quartet repertoire but also performed new works by contemporary Canadian composers like Patricia Blomfield Holt, Walter MacNutt, and John Weinzweig.
She attended classes at the RCMT through 1958 where her professors included Gordon Hallett (piano), Weldon Kilburn (piano), and John Weinzweig (music theory and composition).
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During the 1970s, Beecroft was busy working as a freelance radio producer, notably creating numerous documentaries for CBC Radio on Canadian composers like Jean Coulthard, Harry Freedman, Bruce Mather, Barbara Pentland, Harry Somers, Gilles Tremblay, and John Weinzweig among others.
Among the well-known composers who have written works for the Choir are John Weinzweig, Louis Applebaum, Milton Barnes, Srul Irving Glick, Ben Steinberg and Leon Zuckert.
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In 1951, John Weinzweig met with fellow composers Harry Somers and Samuel Dolin to discuss the issue of composing professionally in Canada.