Montgeroult's Fantaisie is a virtuosic work that serves as a bridge between the Classical style and the early Romantic period. It is uniquely distinguished by its highly sophisticated, improvisatory-style passagework.
At Henle 8 this is concert repertoire: professional-level technique is the entry ticket. The main demands: ornaments that need to sound effortless, not squeezed in; fast passage work that stays light and even at tempo; and fine finger independence within the hand.
Beyond that, expect sweeping arpeggio figures that must stay smooth across positions, and precise articulation — the difference between crisp and blurred is the piece.
At roughly 10 minutes, stamina and memory become part of the challenge — plan practice in sections.
The rapid, intricate finger-work demands flawless articulation and precise control of tempo fluctuations.
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.
Fantaisie is rated Henle level 8 of 9 — concert repertoire, roughly diploma level. In the RCM system it corresponds to about level 10.
You should be comfortable at Henle level 8 — meaning you can already play level 7–8 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 Fantaisie lasts about 10 minutes.
Fantaisie 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 Cadenza to Mozart's Piano Concerto No.23, BV B 9 by Ferruccio Busoni, Cadenza to Mozart's Piano Concerto No. 23 by Ferruccio Busoni, Fantaisie et variations brillantes sur l'air 'Di tanti palpiti' by Friedrich Wilhelm Kalkbrenner — see the full similar-pieces list on this page.