(Photo: Ashley Taylor) Richard Strauss’s one-act opera “Elektra” (1909), with a searing libretto by Hugo von Hofmannsthal, stands as a monumental achievement in 20th-century music drama. A radical adaptation of Sophocles’ tragedy, it plunges the listener into the tormented psyche of Elektra, obsessed with avenging her father Agamemnon’s murder by her mother, Klytämnestra, with the help of her lover Aegisth. {…}