Possible Clues:

• Set due in short musical compositions
• Liszt pieces
• Pianists' dexterity exercises
• Many Chopin piano pieces
• Liszt's "Transcendental __"
• Dexterity exercises
• Short musical studies for which Chopin, for example, is known
• Debussy piano pieces
• Chopin wrote 27 of them
• Chopin composed three collections of them