Related Clues:

• It usually has a key
• Top 40 item
• What any man, woman or child may break into
• Billboard chart entry
• Ballad, for one
• ''Chicago'' or ''Philadelphia''
• Pop or bop
• See 2 Down
• Any one of the Top 40
• Art form
• Medley portion
• Carol, e.g.
• Playing field?
• Partner of words
• Berlin number