Hanson, Howard. (1896-1981) Manuscript Set Theory chartAn uncommon manuscript chart written by Hanson, related to his important publication, "Harmonic Materials of Modern Music: Resources of the Tempered Scale" (New York, 1960), described by Grove as "a seminal work in what would later be termed pitch class set theory." The chart was originally written in pencil, then inked over by the composer. Hanson was winner of the Rome, Pulitzer, and Peabody Awards among many others and was director of the Eastman