Die walkure wwv 86 b chant: Der Ring des Nibelungen. WWV 86 B. Klavierauszug.

This is currently the most up-to-date vocal score available; there are commentaries from productions during Wagner's lifetime added as footnotes on the appropriate pages. The printing and layout are beautiful for the most part, only a few errors I have caught so far. The paper is a good color that is easy to read. And the book lays flat enough to stay open in rehearsal without having to resort to coil binding.