Possible Clues:

• Piece played in a conservatory
• Technique-improving piano piece
• Chopin's "Winter Wind," for one
• Musical piece, duet, spoiled by echo
• Practice piece at a conservatory
• Recital piece, often
• Type of piano piece
• Musical composition -- it's Faur�'s final duet arranged
• Musical piece whose name means "study"
• Music in sci-fi film due for redistribution