And the Beat Goes On: An Introduction to Popular Music in America, 1840 to Today, by Michael C. Campbell
October 1, 1996- PDF https://www.jstor.org/stable/40374295
Introducing American Folk Music, by Kip Lornell
October 1, 1992- PDF https://www.jstor.org/stable/40374207
The Show Choir Movement: Uses and Abuses—A Symposium
October 1, 1983The Ballad Style in the Early Music of the Beatles
October 1, 1979- PDF https://www.jstor.org/stable/40351770