Giovanni Bazzoni's bolero is a minor-key work that highlights the dramatic potential of the dance. It features lyrical sections contrasted with more vigorous rhythmic patterns.
The main challenge is projecting the singing melody over the persistent dance accompaniment.
Comparable difficulty and character — good candidates for what to learn next.
Bolero is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 5.
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 Bolero lasts about 4 minutes.
Bolero 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 Ballade by Amy Marcy Beach, Canto del esclavo by Nicolás Ruiz Espadero, Barcarolle by Józef Wieniawski — see the full similar-pieces list on this page.