A performer and music educator, William Masselos (1920-1992) had a very active concert career, including solo recitals, performances with the New York Philharmonic Orchestra, and numerous other orchestra and chamber music concerts. Masselos also taught music at various universities, including Juilliard and the Catholic University of America, and was a faculty member at many music festivals, including the Aspen Music Festival, the Berkshire Music Festival, and the International Society for Contemporary Music Festival. This collection contains 6.00 linear feet of correspondence, programs, photographs, recordings, scores, articles, and memorabilia related to Masseloss career, the professional organizations and ensembles he was involved with, a...