Related Clues:

• Adjust, as a piano
• Tony-toting Tommy
• It's whistleable
• Catchy thing?
• Berlin number
• iTunes selection
• ''Jingle Bells,'' for one
• Track, perhaps
• Work with notes
• Work on, as an engine
• Get ready to play, say
• Something to sing along to
• 'American Idol' choice
• Ensure that a G is actually a G, say
• Adjust the piano