Programs and other materials for events taking place in the early years at Chicago's Auditorium Theater. Envisioned as a world-class theater and opera house by Chicago impresario Ferdinand Peck, the Adler and Sullivan-designed Auditorium opened in 1889 on the corner of Congress and Michigan Avenue.

Articles and reviews, correspondence, broadcast scripts, photographs, and clippings of the Chicago Tribune performing arts critic from 1942 to 1965. Cassidy wrote her influential "On the Aisle" column for the Tribune, then wrote freelance criticism and hosted a weekly program of arts criticism for WFMT, helping to shape the course of music, theater, and dance in Chicago.

Materials related to the theater career, business, and personal life of Chicago theater producer and philanthropist Hope Abelson, including scripts, theater mementos, correspondence, financial documents, photographs, audio recordings, and video recordings.

Irwin Fischer (1903-1977), composer, professor, conductor, and musician. Enjoyed a long career teaching at the American Conservatory of Music in Chicago, Illinois. Also worked as an organist for the Chicago Symphonic Orchestra and various churches, a conductor for the National Youth Symphony, South Side Symphony, and West Suburban Symphony. Known primarily for scores such as the Hungarian Set (Pearly Bouquet) and Symphony I.