B0680. J. K. Holman. Wagner's Ring, A Listener's Companion & Concordance. Portland, OR, Amadeus, 1996. 440pp. Index; Discography; Bibliography; Photos; DJ. - 9781574670141
"This book explores the mythology, story, music, characters and language of Wagner's monumental work. At its heart is a concordance of the keywords in the four librettos, a powerful reference tool. The volume also includes a brief synopsis of each of the four operas, a presentation of the 145 principal musical motives in order of appearance, and a discussion of the characters and their relationships, listing their appearances and the musical motives associated with them."