A section of Dido’s Lament from the English Baroque opera ‘Dido and Aeneas’, by Henry Purcell:

– sung FORWARDS (listen).

– sung BACKWARDS (listen).

Retrograde (adjective):

1. of, concerning, or denoting a melody or part that is played backwards,

2. tending towards an earlier reverse condition

3. apparent reverse motion of celestial bodies

4. tending to degenerate

4. another word for retreat