This piece is a salon-style fantasy based on themes from Adolphe Adam's opera Si j'étais roi. It features lighthearted embellishments typical of the 19th-century operatic transcription tradition.
At Henle 4 this is an intermediate piece that expects secure technique and real attention to phrasing. The main demands: sweeping arpeggio figures that must stay smooth across positions; a true singing tone, with the melody floating above the accompaniment; and ornaments that need to sound effortless, not squeezed in.
Beyond that, expect fast passage work that stays light and even at tempo.
The primary challenge is maintaining a light, agile touch during rapid fioritura passages.
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.
Fantaisie sur 'Si j'étais roi' is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 sur 'Si j'étais roi' lasts about 6 minutes.
Fantaisie sur 'Si j'étais roi' 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 sur 'Aïda' by Alexandre Croisez, Fantaisie élégante sur 'La traviata' by Alexandre Croisez, Fantaisie élégante sur 'Il trovatore' by Alexandre Croisez — see the full similar-pieces list on this page.