Mat Callahan is author or editor of five books including The Explosion of Deferred Dreams: Musical Renaissance and Social Revolution in San Francisco, 1965-1975 and A Critical Guide to Intellectual Property. His recent projects include the republication of Songs of Freedom: The James Connolly Songbook by Irish revolutionary James Connolly; the recording and publication of¿Working-Class Heroes: A History of Struggle in Song: A Songbook;¿and the launch of the multimedia project Songs of Slavery and Emancipation, which includes this book, an album of song recordings, and a film.