Given the many references to Shakespeare throughout the novel, it’s possible that the play being performed is Shakespeare’s
Othello, in which the main character, Othello, kills his wife because he thinks she has been unfaithful. Orlando, too, suspects that Sasha has been unfaithful, and he fantasizes about killing her just as Othello kills Desdemona in Shakespeare’s play. The words are “like music” to Orlando because he idolizes Shakespeare above all other poets.