Possible Clues:

• Middle of a play, often
• When Macbeth gives his dagger soliloquy
• When 92-Across says "Well, happiness to their sheets!"
• Broadway production segment, often
• When to hear 'O Romeo, Romeo! wherefore art thou Romeo?'
• When Hamlet declares 'The play's the thing'
• When Juliet says ''Parting is such sweet sorrow''
• Half of a musical second
• It ends with Lear heading out into stormy weather
• Intermission ender, maybe