Bill articulates how music propels dramatic action and sustains poignant moments in performing arts. “Incidental music” may be a misnomer. It started with Greek dramas but, as Bill explains, music often plays a pivotal if not starring role. Example: in the opening scene of the play Moderen (The Mother) by Helge Rode, Nielsen’s two-minute “The Fog is Lifting” drives the tableau of a mother leaving her son. Works by Fauré, Mendelssohn, Debussy, and others are equally compelling.