Georgy Catoire's '4 Preludes' Op. 17 are introspective and harmonically adventurous works from the early 20th century. They are known for their subtle mood shifts and delicate pianistic textures, often exploring impressionistic colors.
The main technical challenge is achieving nuanced dynamic control and sensitive pedaling to create ethereal and blended sonorities.
4 Preludes (Op.17) is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of 4 Preludes (Op.17) lasts about 9 minutes.
4 Preludes (Op.17) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.