(Credit: Gregor Hohenberg/Sony) Oper Frankfurt has announced that it will ring in the New Year by streaming a 2010-11 production of Johann Strauss’ operetta “Die Fledermaus.” The operetta features Christian Gerhaher in the role of Gabriel von Eisenstein, alongside Barbara Zechmeister as Rosalinde, Thorsten Grümbel as Frank, Martin Wölfel in the roles of Prinz Orlofsky / Frosch, Stephan Rügamer as {…}