August Enna was a Danish composer primarily known for his operas, and his piano Barcarolles reflect a typical 19th-century lyrical style. This piece is distinctive for its fluid, wave-like accompaniment that supports a vocal-style melody.
The primary challenge is maintaining a consistent, rocking 6/8 pulse while balancing a singing melody against the accompaniment.
Comparable difficulty and character — good candidates for what to learn next.
Barcarole 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 Barcarole lasts about 4 minutes.
Barcarole 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 Bossa Nova by Serban Nichifor, Blumengruss by Carl Bohm, Barcarole by Erkki Melartin — see the full similar-pieces list on this page.