Translation guide
An etude is a musical composition designed to practice a specific technique. In Japanese, it is most commonly referred to as エチュード, a loanword from French, or 練習曲 (れんしゅうきょく), the native term.
A short musical composition, typically for a solo instrument, intended to develop a particular technical skill.
The most common term in modern Japanese, borrowed from French. Used widely in music education and performance contexts.
Chopin's etudes are difficult.
The native Japanese term, literally 'practice piece'. Slightly more formal or traditional, but still common.
I'm practicing a piano etude.
This etude is good for finger training.