A highly complex, avant-garde work that explores rapid, shifting patterns and rhythmic density. It is musically notable for its mechanical, almost motoric energy contrasted with sudden silence.
The primary challenge is maintaining exact rhythmic precision while navigating the highly irregular, dissonant note clusters.
Comparable difficulty and character — good candidates for what to learn next.
...et qua diversa moventur is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 9.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 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 ...et qua diversa moventur lasts about 5 minutes.
...et qua diversa moventur 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 Sonatine by Maurice Ravel, Variations sérieuses by Felix Mendelssohn, Étude in C-sharp minor, No. 4 by Frédéric Chopin — see the full similar-pieces list on this page.