etude
US /ˈeɪ.tuːd/
UK /ˈeɪ.tuːd/

1.
estudio, etude
a short musical composition, typically for one instrument, designed as an exercise to improve the technique or skill of the player.
:
•
The pianist practiced the challenging Chopin etude for hours.
El pianista practicó el desafiante estudio de Chopin durante horas.
•
Many composers have written beautiful etudes for various instruments.
Muchos compositores han escrito hermosos estudios para varios instrumentos.