The music collections are spread over three Library departments. The main collections of music literature and printed music are held in the Music Library, located in the Ussher Library. The open access collections are focussed on supporting the academic needs of students and staff of the College. They include books and periodicals on music, reference works and bibliographies (including online databases), as well as a separate collection of student lending material. Printed music on open access includes collected editions of the works of over 70 composers, anthologies, manuscript facsimiles, and other individual works and editions. The closed access collection is large and diverse, containing items received under legal deposit mainly since about 1880.
Earlier printed music is held in the Department of Early Printed Books. Two special collections stand out: the Ebenezer Prout Collection, particularly strong in music and editions of the 19th century, and the Townley Hall Collection, a country house collection of the 18th and 19th centuries.
The Department of Manuscripts holds all music manuscript material. The collection includes liturgical music of the 11th-18th centuries, the Ballet and Dallis lute books, the 16th-century Dublin Virginal Book, the Mercer's Hospital collection, and Irish folk music collected by Petrie, Goodman and Moeran. Several twentieth century Irish composers (Barry, Boydell, Boyle, Deale, Duff, May, Victory) are also represented.