Related Clues:

• One may be backed up
• ___ Building, company headquarters erected in 1908 in New York City, at the time the tallest building in the world
• Bass or tenor
• Numbers specialist
• 'American Idol' hopeful
• Perhaps the way the sewer might become vocal?
• It might be a sewer, perhaps, but sounds nice
• Sewer with 7 down?
• The sort of sewer for a song
• That'll give you the music of the sewer
• A sewer for 34 across
• An invoice for a sewer
• One might have one in stitches in opera
• One might have an invoice for such a sewer, perhaps
• One's invoice, perhaps, has one in stitches