Brook Song is a typical salon piece from the late 19th century, evocative of water flowing through the gentle use of light, melodic patterns. It is musically notable for its simple but effective depiction of nature, standard to the period's repertoire.
The primary challenge is to maintain an even, flowing quality in the sixteenth-note passages while keeping the melodic line articulate.
Comparable difficulty and character — good candidates for what to learn next.
Brook Song (Op.118) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 3.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 Brook Song (Op.118) lasts about 3 minutes.
Brook Song (Op.118) 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 Autumn Song by William F. Sudds, Bon Ton by William F. Sudds, Believe Me, If All those Endearing Young Charms by Irish Folk Music — see the full similar-pieces list on this page.