This Concert-Etüde by Rudolf Willmers is a representative example of 19th-century salon-virtuoso writing. It emphasizes rapid scale passages and melodic projection in the upper register characteristic of the period.
At Henle 7 this is a late-advanced work — the technical demands are serious and sustained. The main demands: fast passage work that stays light and even at tempo; sweeping arpeggio figures that must stay smooth across positions; and fine finger independence within the hand.
Beyond that, expect a true singing tone, with the melody floating above the accompaniment, and rubato that must breathe naturally without losing the pulse.
Maintaining an even tone while executing rapid passagework is essential for this piece.
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.
Concert-Etüde (Op.105) is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above. In the RCM system it corresponds to about level 9.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 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 Concert-Etüde (Op.105) lasts about 6 minutes.
Concert-Etüde (Op.105) 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 Fantaisie-Impromptu in C-sharp minor by Frédéric Chopin, Rhapsody in Blue (Solo Piano) by George Gershwin, 'I Got Rhythm' Variations by George Gershwin — see the full similar-pieces list on this page.