Possible Clues:

• When Jud dies in "Oklahoma!"
• Mimic to report after the intermission perhaps
• Setting for many reprises
• When the Anvil Chorus is heard
• Middle part?
• Second play section
• When Juliet says 'Parting is such sweet sorrow'
• End of most musicals
• When Juliet asks "Wherefore art thou Romeo?"
• Routine couple contribute to conventional play centre