Technical compositions

• Chopin's "Raindrop" and "Butterfly," e.g.
• Some piano pieces
• Chopin's 27
• Musical exercise pieces
• Musical studies
• Musical practice pieces
• Chopin's "Waterfall" and "Tristesse," e.g
• Four Stravinsky works

Wikipedia Word definitions in Wikipedia
The Études by Frédéric Chopin are three sets of solo studies for the piano published during the 1830s. There are twenty-seven compositions overall, comprising two separate collections of twelve, numbered Opus 10 and 25, and a set of three without opus number. ...

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