This Fantasia is an example of late-period or lesser-known 20th-century American writing. It avoids strictly traditional forms, instead favoring episodic development and shifted tonal centers.
At Henle 4 this is an intermediate piece that expects secure technique and real attention to phrasing. The main demands: precise articulation — the difference between crisp and blurred is the piece; sharp dynamic and character contrasts held together in one arc; and chord voicing — bringing out one note inside a handful of others.
Pay close attention to the shifting dynamic levels and precise articulations required to define the piece's structure.
Comparable difficulty and character — good candidates for what to learn next.
A level or two down with the same spirit — ideal if this piece is still out of reach.
Where this piece's skills lead: slightly harder works making similar technical demands.
Fantasia 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 Fantasia lasts about 4 minutes.
Fantasia 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 Der Galgenritt by Paul Hindemith, Basso Ostinato, VL 267 by Mikalojus Konstantinas Čiurlionis, Die Dämonen by Johann Strauss Sr. — see the full similar-pieces list on this page.