Henry Ketten was a virtuosic pianist whose compositions often demanded a high level of finger dexterity. His Boléro Op. 72 utilizes rapid-fire passagework and decorative figuration to evoke the intensity of Spanish dance.
The primary challenge lies in executing the rapid ornamental runs with clarity and evenness.
Comparable difficulty and character — good candidates for what to learn next.
Boléro (Op.72) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
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 Boléro (Op.72) lasts about 5 minutes.
Boléro (Op.72) 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 Caprice hongrois by Henry Ketten, Caprice hongrois by Henry Ketten, Basquaise de 'Le capitaine Fracasse' by Henry Ketten — see the full similar-pieces list on this page.