This waltz by Joseph Delafosse is a lively, virtuoso-oriented piece intended for the concert salon. It uses technical flourishes to evoke the excitement and movement of a ballroom.
The primary challenge is maintaining speed and clarity in the right-hand arpeggios.
Comparable difficulty and character — good candidates for what to learn next.
Au bal (Op.90) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 6.
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 Au bal (Op.90) lasts about 4 minutes.
Au bal (Op.90) 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 Bertolinette by Joseph Delafosse, Alexander's Ragtime Band by Irving Berlin, 'S Wonderful by George Gershwin — see the full similar-pieces list on this page.