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There are a number of great sources to help you research music in the 20th and 21st centuries. Here is short, curated list of some of the resources most directly relevant to your subject area and available online through the University of Toronto Libraries.
You're also welcome to stop by the Music Library and get research help to explore your topic more in depth. Ask for reference help at the service desk! Reference services are available M-F, 10-4. You're also welcome to make an appointment with me using the contact information on this page.