Graham Lock is a freelance writer, Special Lecturer in American Music, University of Nottingham, and author of Forces in Motion: Anthony Braxton and the Meta-reality of Creative Music (Quartet, 1988), Chasing the Vibration: Meetings with Creative Musicians (Stride, 1994), and Blutopia: Visions of the Future and Revisions of the Past in the Work of Sun Ra, Duke Ellington and Anthony Braxton (Duke, 1999).

David Murray is Professor of American Studies, University of Nottingham, and author of Matter, Magic and Spirit: Representing Indian and African American Belief (Pennsylvania, 2007), Indian Giving: Economies of Power in Early Indian-White Exchanges (Massachusetts, 2000), and Forked Tongues: Speech, Writing and Representation in North American Indian Texts (Indiana, 1992).