Gustav Kobbe 
Wagner’s Music-Dramas Analyzed [PDF ebook] 
With the Leading Motives; Nibelung, Tristan, Mastersingers, Parsifal

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The scores to which frequent references are made in this book are the Piano Scores, with Words (simplified edition), by R. Kleinmichel, of The Ring of the Nibelung Music Dramas and The Mastersingers the Piano Score with words of Tristan and Isolde, by Von Bulow, and the Piano Score with words of Parsifal, by Joseph Rubinstein.