The most striking aspect of the works on this disk is -contrary to contemporary/modern music's reputation as difficult- their immediate sonic attractiveness, the sensuous (and, as Boulez himself would probably describe it, 'seductive') appeal. So, for example, Répons has sections nicknamed 'Scriabin' and 'Lulu' -the latter obviously after Berg's opera- two composers known for their gorgeousness. This is not to imply any lack of rigor, for this music still yields plenty of pleasure after many listens. Indeed, especially Répons warrants a effort on behalf of the listener, since it's quite intense and Boulez's conception of form as an ongoing spiral constantly echoing itself can be hard to grasp. In addition to the previously mentioned composers, there's also a Balinese section; the piece is positively imbued with the exotic, colourful, interesting and resplendent If you like music that has these qualities, this is an absolute necessity.