A standard didactic salon piece typical of late 19th-century sheet music intended for instruction. It utilizes simple structural forms and standard harmonic cadences common to pedagogical works of the time.
Focus on the balance between the melodic right hand and the supporting alberti-bass patterns.
Comparable difficulty and character — good candidates for what to learn next.
Billy Green is rated Henle level 2 of 9 — beginner repertoire, roughly ABRSM grades 2–3. In the RCM system it corresponds to about level 2.
You should be comfortable at Henle level 2 — meaning you can already play level 1–2 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 Billy Green lasts about 2 minutes.
Billy Green 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 Arroz con leche by Anonymous, 18 German Dances and Esoccaises by Franz Schubert, 18 German Dances and Ecossaises by Franz Schubert — see the full similar-pieces list on this page.