A new recording of the carefully refined, endlessly revised oeuvre of Pierre Boulez is always worth celebrating, but this one stems from a source hitherto unknown in the composer’s own instrumentarium: the recorder. In 2011 Boulez granted special permission to the Dutch recorder virtuoso Erik Bosgraaf to make his own transcription of the spectral adventure in musical space that is Dialogue de l’ombre double, originally composed for clarinet (and pre-recorded/live electronics). A later piece along similar lines, Anthèmes II for violin has become better known, but Dialogue weaves its own theatrical magic.