TY - BOOK AU - Rochberg,George TI - The hexachord and its relation to the 12-tone row AV - MT50 .R67 U1 - 781.25 ROC 20 PY - 1955///] CY - Bryn Mawr, Pa. PB - Presser KW - Schoenberg, Arnold, KW - Hexachords KW - Twelve-tone system ER -