Stump the German

[Eva Elisabeth]

Another good guess, but not him either, Roger. I encourage to ask yes/no questions...

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Hint #1: Here comes another quote by the same person, dating from the same period and "occasion" in the person's life:

"The opera is good, the only ballet I ever saw that was not a bore. 'Faust' was superbly given a few
nights ago."

The hint comes with a second question about which to think might help to find out the person - where was "Faust" superbly given?