Possible Clues:

• Piece that teaches technique
• Exercise of a sort
• Chopin's "Revolutionary," for one
• English duet rewritten as short musical piece
• It may have a lot of scales
• Piece for practice
• Noted composition for spirited duet with energy
• Chopin's "The Winter Wind," e.g.
• A musical exercise
• Chopin composition, e.g.