"The Boulez enigma is richly displayed throughout this fascinating and deeply satisfying disc…. To see Boulez working on The Rite of Spring with young conductors, always hands on but never dogmatically overbearing, will give the lie to anyone who assumes that his approach to interpreting modern music has always been that of a mechanistic dictator, inflexibly precise but emotionally repressed, rather than as an open-minded and good-humoured advocate for the music he values most…. A uniquely revealing portrait."—Gramophone