Carl Weinmüller
... that Beethoven's only opera, Fidelio, was a failure in its original form, but was revised partly at the behest of Carl Weinmüller, who then appeared in the premiere in the bass role of Rocco?
... that Beethoven's only opera, <i id="mwBN8"><a href="./Fidelio" id="mwBOA" rel="mw:WikiLink" title="Fidelio">Fidelio</a></i>, was a failure in its original form, but was revised partly at the behest of <b id="mwBOE"><a href="./Carl_Weinmüller" id="mwBOI" rel="mw:WikiLink" title="Carl Weinmüller">Carl Weinmüller</a></b>, who then appeared in the premiere in the <a href="./Bass_(voice_type)" id="mwBOM" rel="mw:WikiLink" title="Bass (voice type)">bass</a> role of Rocco?