(Amadeus). 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.