The scholarly study of music in the United States includes work relating music to social class, racial, ethnic and religious identity, gender and sexuality, as well as studies of music history, musicology, and other topics. The academic study of American music can be traced back to the late 19th century, when researchers like Alice Fletcher and Francis La Flesche studied the music of the Omaha peoples, working for the Bureau of American Ethnology and the Peabody Museum of Archaeology and Ethnology. In the 1890s and into the early 20th century, musicological recordings were made among indigenous, Hispanic, African-American and Anglo-American peoples of the United States. Many worked for the Library of Congress, first under the leadership of Oscar Sonneck, chief of the Library's Music Divisions. These researchers included Robert W. Gordon, founder of the Archive of American Folk Song, and John and Alan Lomax; Alan Lomax was the most prominent of several folk song collectors who helped to inspire the 20th century roots revival of American folk culture.