Op. 42 is the most harmonically complex and technically aggressive of the series. It contrasts fast-moving linear lines with abrupt, dissonant chordal punctuations.
At Henle 5 this is a late-intermediate piece — technically substantial, with musical demands to match. The main demands: fast passage work that stays light and even at tempo; big chords that need weight without harshness; and sharp dynamic and character contrasts held together in one arc.
Focus on the physical placement for the wide-spanned chords to ensure consistent accuracy.
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.
Lesser-known works by the same hand, at a comparable level.
Electronic Work (Op.42) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 5.
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 Electronic Work (Op.42) lasts about 4 minutes.
Electronic Work (Op.42) 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 Elegy by Natan Fiedorowicz, Electronic Work by Natan Fiedorowicz, Passacaglia by George Frideric Handel — see the full similar-pieces list on this page.