John Parsons Beach utilizes impressionistic color and flexible tonality to depict the autumnal landscape. It breaks away from strictly functional harmonies in favor of moody, coloristic clusters.
Achieving an atmospheric quality depends on precise control of touch and soft-pedal usage.
Comparable difficulty and character — good candidates for what to learn next.
Autumn Song is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 5.
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 Autumn Song lasts about 3 minutes.
Autumn Song 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 Gymnopédie No. 1 by Erik Satie, Gnossienne No. 1 by Erik Satie, Au lac imaginaire by Herve Roullet — see the full similar-pieces list on this page.