Possible Clues:

• 'Four and twenty blackbirds baked in ___'
• Cap-___ (from head to foot)
• ''. . . baked in __''
• Cap-__ (head to foot)
• "... blackbirds, baked in ___"
• "... baked in ___"
• Cap-___
• ''... blackbirds baked in ___''
• '...blackbirds baked in ___'
• "Four and twenty blackbirds baked in ___..."