Originally composed for wind instruments, this concert solo is a highly lyrical piece that demonstrates the mid-19th-century obsession with operatic vocal lines on instrumental platforms. It is marked by its ornate melodic writing and expansive, arpeggiated accompaniments.
The challenge is managing long, flowing melodic lines that require constant control of breath-like phrasing and expressive ornamentation.
Comparable difficulty and character — good candidates for what to learn next.
11ème Solo de Concert (Op. 85) is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 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 11ème Solo de Concert (Op. 85) lasts about 7 minutes.
11ème Solo de Concert (Op. 85) 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 Liebestraum No. 3 in A-flat major by Franz Liszt, Nocturne in E-flat major, No. 2 by Frédéric Chopin, Étude in E major, No. 3 by Frédéric Chopin — see the full similar-pieces list on this page.