Possible Clues:

• Mark Antony's request to the farmer when he realized he didn't have enough corn for the cookout?
• Shakespearean entreaty appropriate for 19-, 25- and 43-Across?
• How Marc Antony said ''Listen''
• Listen out for mere roundelays
• Antony's exhortation
• Shakespearean demand?
• Banker's attention-getter?