Magee was one of the few writers to take Wagner seriously as a thinker
(I suppose Roger Scruton is another although I've yet to read any of
his books on Wagner). Magee's book on Schopenhauer is excellent and has
a large chapter on Schopenhauer and Wagner which I've always found to
be hugely convincing, providing a philosophical rationale for Tristan,
Meistersinger and Parsifal.