Based on Moniuszko's Polish opera Halka, this work incorporates nationalistic elements into the fantasy structure. It balances moments of national pride with the typical operatic sentimentality of the era.
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; a left hand with real melodic or rhythmic responsibility of its own; and ornaments that need to sound effortless, not squeezed in.
Balancing the dense, lower-register accompaniment with the singing melodic lines requires careful voicing.
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.
Lesser-known works by the same hand, at a comparable level.
Fantaisie sur 'Halka' (Op.51) 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 Fantaisie sur 'Halka' (Op.51) lasts about 6 minutes.
Fantaisie sur 'Halka' (Op.51) 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 Ballade by Józef Nowakowski, Ballade No.2 by Józef Nowakowski, Fantaisie sur des airs polonais by Józef Nowakowski — see the full similar-pieces list on this page.