Musical compositions by Carl Hager, including works for string quartet, orchestra, three male voices, solo voice and guitar, solo voice and string quartet, organ, piano, and classical guitar.

Manuscripts of his work; letters written by friends, 1974- 1975; passport; will of his wife, Mary Mathes; and tape recordings of his Masses and other music.

Chiefly course material for the music classes he taught, especially Introduction to Music and Introduction to the Classic Symphony: notes and notebooks, music manuscripts, essays, and letters from his career as a professor of music at Notre Dame. Also a notebook from a Literature Course taught by Frank O'Malley at Notre Dame, 1955-1956, and a spirit-duplicator booklet by Daniel H. Pedtke, "Keyboard Theory: Modulation - Transposition - Harmonization".

Records of Notre Dame's Music Department, including many audio recordings and photographs.

Collection consists of event programs, reviews of operatic performances and publications, interviews, photographs, and recordings documenting the career of Georgine Resick, current Professor Emerita of Voice at the University of Notre Dame. Collection materials cover Resick’s career as an opera singer, spanning performances from 1975 to 2012, many of which took place in European countries.