Dido and Aeneas
The opera's tragic outcome is hinted at almost at once in the accompaniment to the Queen's Act 1 aria. The modulation in the ground bass from C minor to G minor on the words "I languish till my grief is known" anticipates the key of Dido's lament in Act 3. Purcell uses a ground bass at other moments: Dido's two arias (Acts 1 and 2) and in the aria "Oft she visits" in Act 2. This aria references Actaeon's tragic death by his own hounds. The word "ground" suggests that which will cover Dido after her death.