To inspire his production of Handel’s Ariodante for the Salzburg Festival, director Christof Loy turned to a novel that shares a name with the opera’s source material (Ariosto’s Orlando furioso): Virginia Woolf’s Orlando. He makes no secret of this source, as quotes from Orlando (in Italian, for the sake of linguistic continuity) interrupt the overture and precede the third act. The concept is both consistent and effective. A mishmash of costume time periods from...