Duo is a love story and a dialogue in four scenes. The dramatis personae are A Man (played by the violin) and A Woman (played by the harp). The Meeting, initiated by the violin, develops into a flirtatious waltz and an awakening of tender love. Then follows Prayer a tender love-song with a beautiful violin melody over a rocking, hypnotic harp part. However, the course of true love never did run smooth and the music leads next into an angry Quarrel, but after this long, violent interchange the music suddenly breaks off and there comes a solo violin cadenza (Lento) expressive of a touching, conciliatory regret. A final Reconciliation (Lento) brings the dialogue to a tenderly peaceful close.