Possible Clues:

• Composer's piece
• It's an important bit of work to order half of supper to be taken back
• Magnum __: great work
• Symphony or sonata
• Wagner work
• Work of art
• 27, for Beethoven's "Moonlight"
• Sonata, e.g.
• Rhapsody, perhaps
• Musical work for piano in part of 10