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RILM Abstracts of Music Literature is a comprehensive international bibliography of writings on music covering publications from the early 19th century to the present. Search RILM for journal articles on your topic. RILM will provide you with an abstract of each article so you gage how useful it will be to you and a "Get it! UTL" button that will lead you to the article.
JSTOR is a digital library that provides access to more than 10 million academic journal articles, books, and primary sources in 75 disciplines, including music! If you find an article in RILM that you would like to read, search for the article in JSTOR which will provide you with the full text article downloadable as a PDF.