Edward Campbell is Professor of Music at the University of Aberdeen where he specialises in contemporary European art music and aesthetics. His published work includes the books Boulez, Music and Philosophy (2010), Music after Deleuze (2013) and the co-edited volume Pierre Boulez Studies (2016). Peter O'Hagan is a pianist and writer specialising in contemporary music. He has given numerous concerts at London's South Bank Centre and Wigmore Hall, as well as at festivals of contemporary music in Europe and the USA.