Moniuszko’s Barcarola is a lyrical salon piece typical of 19th-century Polish Romanticism. It captures the undulating movement of a boat through a gentle, persistent compound meter.
The main challenge is balancing the lyrical melody against the swaying accompanimental figuration.
Comparable difficulty and character — good candidates for what to learn next.
Barkarola 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 Barkarola lasts about 4 minutes.
Barkarola 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 Bajka by Stanisław Moniuszko, Barcarolle by Anton Stepanovich Arensky, Albumblatt in A minor by Johannes Brahms — see the full similar-pieces list on this page.