The Irving S. Gilmore Music Library is particularly strong in American and European music. Eighteenth-century resources include manuscript and printed music: scores and parts for instrumental and vocal music, chamber music, and larger ensembles; hymnals and tune books; and popular sheet music. The first large-scale histories of music and biographies of musicians, as well as theoretical treatises and instrumental methods are also present. Early periodicals contain both music and writings on music and performances. A collection of engravings has portraits of composers and musicians, representations of musical instruments, caricatures, and works of art. Several collections include manuscript letters of 18th-century musicians and composers. In addition, a number of historically-informed performances exist in sound and video recordings.