Possible Clues:

• When Eliza sings "Wouldn't It Be Loverly?"
• Common time for character exposition, onstage
• ''Hamlet'' starter
• Start on a stage
• It may follow the dimming of lights
• It opens with thunder and lightning, in "Macbeth"
• Where to see a dramatic beginning?
• When Giselle dies in "Giselle"
• It may follow an overture
• ''Henry V'' opener