Chopin wrote 27 of them

• Piano practice pieces
• Chopin's "Raindrop" and "Butterfly," e.g.
• Chopin works
• Musical compositions
• Some exercises
• Liszt's "Paganini ___"
• Certain Chopin works
• Musician's exercises
• Piano school lessons

Wiktionary Word definitions in Wiktionary
n. (plural of etude English)