Edward Campbell shows how philosopher Gilles Deleuze, when contemplating music, can steer musicians productively away from their verbal comfort zones. Centring on the contact between Deleuze and Pierre Boulez, Dr Campbell explores and explains some particularly challenging ways of thinking about philosophical and musical modernity. Music after Deleuze proves to be both fascinating and open-ended, and it confirms that the on-going engagement between philosophy and music (non-Western or popular as much as Western and classical) continues to provoke and to intrigue.