The first biography of the composer Gérard Grisey shows how the artist's sensuality and rigor came together to form the musical genre known as spectralism. The French composer Gérard Grisey (1946-98) changed the course of music history with his small but potent output. Labeled "spectral" music, his compositions looked to the physics of sound and the capacities of human perception for material and inspiration. Born in Belfort, Grisey was the son of a French Resistance veteran turned car mechanic and a homemaker. His first instrument was as humble as his background: the accordion. But...