Maurice Decourcelle's work is a quintessential example of the minor-master salon fantasy genre common in the mid-19th century. It emphasizes expressive sentimentality over complex technical display.
At Henle 4 this is an intermediate piece that expects secure technique and real attention to phrasing. The main demands: careful pedaling — clarity depends on the foot as much as the fingers; sweeping arpeggio figures that must stay smooth across positions; and a true singing tone, with the melody floating above the accompaniment.
Attention to nuanced pedaling is required to prevent the harmonies from sounding muddy during wide-span arpeggiated sections.
Comparable difficulty and character — good candidates for what to learn next.
A level or two down with the same spirit — ideal if this piece is still out of reach.
Where this piece's skills lead: slightly harder works making similar technical demands.
Fantaisie élégante (Op.21) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 Fantaisie élégante (Op.21) lasts about 4 minutes.
Fantaisie élégante (Op.21) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Fanfare-polka by Maurice Decourcelle, Fantaise élégante by Maurice Decourcelle, Body and Soul by Johnny Green — see the full similar-pieces list on this page.