Mervyn Cooke is Professor of Music at the University of Nottingham. He is the author of Jazz, The Chronicle of Jazz, and Britten and the Far East; co-author of Benjamin Britten: Billy Budd; editor of The Cambridge Companion to Benjamin Britten (1999) and The Cambridge Companion to Twentieth-Century Opera (forthcoming) and is currently writing a history of film music for Cambridge University Press. He is also a composer and pianist. David Horn is Director of the Institute of Popular Music at the University of Liverpool. He was a founding editor of the journal Popular Music (Cambridge University Press) and is author of two bibliographies of American music. He is currently joint managing editor of The Encyclopedia of Popular Music of the World.