Volume I of this new edition is a basic textbook on the development of pipe organ composition in geographically diverse schools. Its nineteen chapters include charts of organ composers and a historical background of contemporary events and figures for each organ composition school. Chapter bibliographies are completely updated with corollary readings that have appeared since 1973. A listing of Bach organ compositions with pagination of various editions is also included. Volume II has been substantially revised and enlarged and gives biographical sketches of organ composers and an alphabetical list of each composer's works (including pagination in the major organ music anthologies), publisher, catalog number, and copyright date. A directory of organ music publishers is also provided. The combined set is an indispensable resource for organists, organ teachers, and music scholars everywhere.