Mitch Friedfeld writes:

>De La Grange says that on May 8 (sic), 1906, Mahler conducted Tristan.
>The next day, Hitler attended a performance of The Flying Dutchman,
>conducted by Franz Schalk.  De La Grange adds that "probably" on May 22,
>Hitler attended Lohengrin, again conducted by Schalk.

The problem seems to boil down to which of two experts you prefer.  Does
La Grange specifically source his version? Hamann does, but only to the
extent of her interest, which is to show that Hitler was an admirer of
Mahler as a conductor, as was the case with most Viennese music lovers of
the time.  Interest in Mahler's own compositions fell more into province
of the initiated.  Hamann, a Viennese and who is currently the leading
contemporary historian on Hitler's time spent in Vienna, claims that
orchestra records fail to show who conducted at performances on the days
here concerned.  But she does not seem to have checked other sources, such
as newspapers, something she does do in many other matters treated in the
book.  Maybe La Grange checked old newspaper files? Does he claim that--and
if so does he give full sourcing?

Denis Fodor