Peter Benoît's Fantasia No. 4 is a relatively obscure Romantic work reflecting the Belgian school's harmonic language. It is characterized by expressive, song-like melodies paired with mid-19th-century salon aesthetics.
At Henle 5 this is a late-intermediate piece — technically substantial, with musical demands to match. The main demands: a true singing tone, with the melody floating above the accompaniment; rubato that must breathe naturally without losing the pulse; and chord voicing — bringing out one note inside a handful of others.
Beyond that, expect fine finger independence within the hand.
The primary challenge is maintaining a consistent cantabile line over denser accompanimental textures.
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.
Fantasia No.4 (Op.20) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Fantasia No.4 (Op.20) lasts about 5 minutes.
Fantasia No.4 (Op.20) 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 Derde Fantasie by Peter Benoît, Fantaisie No.3 by Peter Benoît, Fantaisie by Gabriel Fauré — see the full similar-pieces list on this page.