Desc: Opus 20 Modern Masterworks: Olivier Messiaen: Directed by Helmut Rost. With Pierre Boulez, Olivier Messiaen. A documentary introduction by conductor Pierre Boulez, a former pupil of Messiaen and musicologist Michael Nupen precedes the performances of "Chronochromie" played by the Junge Deutsche Philharmonie and "Oiseaux exotiques" played by the Ensemble InterContemporain specially staged at the Alter Oper in Frankfurt, Germany.