Théodore Lack was a prolific French salon composer whose keyboard works often mirror the fashionable ballroom rhythms of his time. This Boléro is a character piece that emphasizes rhythmic precision and the characteristic triplet patterns of the genre.
Maintain a steady rhythmic pulse while ensuring the crisp articulation of the dance-like triplets.
Comparable difficulty and character — good candidates for what to learn next.
Boléro (Op.27) 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 Boléro (Op.27) lasts about 4 minutes.
Boléro (Op.27) 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 Bonne brise by Théodore Lack, Canzonetta giocosa by Théodore Lack, Bataille de fleurs by Théodore Lack — see the full similar-pieces list on this page.