Halsey Stevens was an American composer, musicologist, and teacher. He is best known for his chamber music works and published monograph, The Life and Music of Bela Bartok. The collection contains music manuscripts, writings, research materials, programs, correspondence, and other materials related to his projects. Only the music materials are available online at this time. These materials consist of scores, parts, and sketches for instrumental works for keyboard, chamber ensemble, and full orchestra, as well as vocal and choral works and arrangements for varying instrumentations.