This is a complete revision of the second edition, designed as a guide and resource in the study of music from the earliest times through the Renaissance period. The authors have completely revised and updated the bibliographies; in general they are limited to English language sources. In order to facilitate study of this period and to use materials efficiently, references to facsimiles, monumental editions, complete composers' works and specialized anthologies are given. The authors present this systematic organization in this volume in the hope that students, teachers, and performers may find in it a ready tool for developing a comprehensive understanding of the music of this period.