Henry Cowell's work recontextualizes the Baroque invention form through the lens of 20th-century harmonic dissonance and polyphonic layering. It is a highly cerebral piece that demands rhythmic precision.
Focus on the independent articulation of the individual voices to ensure the contrapuntal lines remain distinct.
Comparable difficulty and character — good candidates for what to learn next.
2-Part Invention in 3 Parts, HC 754 is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 7.
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 2-Part Invention in 3 Parts, HC 754 lasts about 3 minutes.
2-Part Invention in 3 Parts, HC 754 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 Basso Ostinato, VL 267 by Mikalojus Konstantinas Čiurlionis, Capriccio di obligo di cantare la quinta parte senza toccarla by Girolamo Frescobaldi, Bhavapriya Prelude and Fugur by Carlotta Ferrari — see the full similar-pieces list on this page.