For 10 points, name this German composer of Elektra and Die Fledermaus.
This composer wrote one opera in which one character believes her son Orestes is dead when in fact he is moments away from killing her. In Act I of one comic opera by this composer, the singing teacher Alfred allows himself to get arrested in place of Eisenstein ["eye-sen-stein"] to protect his affair with Eisenstein's wife. Later in that opera, it is revealed that Falke is having a ball for getting revenge for having been abandoned while in a bat costume. For 10 points, name this German composer of Elektra and Die Fledermaus.
This composer wrote one opera in which one character believes her son Orestes is dead when in fact he is moments away from killing her.
{R}ichard {Strauss} [prompt on {Strauss}; do not accept {J}ohann {Strauss}]