Possible Clues:

• Sung story
• Musical setting of a text, with arias, recitatives etc
• Work for accompanied voice
• Piece from rod cut so long
• Vocal work with orchestra
• Arthur Honegger's 'A Christmas ___'
• Is able to see you producing piece of music
• Choral composition for performance at a concert
• Soldier perhaps entertained by jazz fan with a classical item
• With odds and ends in tin, amateur finds choral work