The Deiro Archive, part of the former Center for the Study of Free-Reed Instruments at the Barry S. Brook Center, preserves a remarkable body of materials documenting the early history of the accordion in the United States. Donated by Guido Roberto Deiro and Sandra Cattani, the collection brings together printed and recorded documents related to the lives and careers of Guido Deiro (1886–1950) and Pietro Deiro (1888–1954), brothers who played a central role in introducing and popularizing the piano-accordion in American musical life. The archive offers an essential resource for the study of free-reed instruments and their cultural circulation. Beyond organology, it opens onto broader histories of performance and entertainment: both brothers were major figures on the vaudeville stage, and their careers illuminate a vibrant chapter in the history of American popular performance. At the same time, the materials provide a focused lens on the Italian American immigrant experience, tracing how musical practice, identity, and opportunity intersected in the early 20th century. Organized into two principal sections, the Guido Deiro materials and the Pietro Deiro materials (including documentation related to Pietro “Lee” Deiro, Jr.), the archive reflects the distinct trajectories and shared legacy of the Deiro family. Its holdings support research across music history, performance studies, immigration history, and popular culture. The Deiro Archive is housed in Special Collections at the CUNY Graduate Center’s Mina Rees Library and is available for consultation by appointment. Explore the archive that traces how a single instrument, and the performers who championed it, helped shape American musical culture. Guido Deiro Materials Pietro Deiro Materials Contact information: Barry S. Brook Center for Music Research and Documentation CUNY Graduate Center 365 Fifth Avenue New York, NY 10016 (212) 817-1991 cmrd@gc.cuny.edu