This work explores complex rhythmic structures, as suggested by the mathematical title. It is a highly analytical piece that tests a performer's grasp of asymmetrical time signatures.
At Henle 5 this is a late-intermediate piece — technically substantial, with musical demands to match. The main demands: polyrhythms that have to lock together without sounding mechanical; fast passage work that stays light and even at tempo; and precise articulation — the difference between crisp and blurred is the piece.
The primary challenge is maintaining rhythmic stability while executing the irregular groupings characteristic of the work.
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.
Evolution 12=7+5 is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Evolution 12=7+5 lasts about 4 minutes.
Evolution 12=7+5 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 Courante (from French Suite No. 2 by Johann Sebastian Bach, Bergamasca by Girolamo Frescobaldi, Capriccio XV in F major, FbWV 515 by Johann Jacob Froberger — see the full similar-pieces list on this page.