This is a transcription of Ravel's iconic orchestral work, famously characterized by its relentless, unchanging ostinato rhythm. The piano adaptation requires immense stamina and precise dynamic control to build the massive crescendo from start to finish.
The primary challenge is maintaining the strict, metronomic pulse while managing the building complexity of the textures.
Comparable difficulty and character — good candidates for what to learn next.
Boléro is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above. In the RCM system it corresponds to about level 10.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 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 lasts about 15 minutes.
Boléro 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 Jeux d'eau by Maurice Ravel, Le tombeau de Couperin by Maurice Ravel, Sonatine by Maurice Ravel — see the full similar-pieces list on this page.