Ramin Kuliev's composition style incorporates Azeri folk-inspired thematic material combined with virtuosic piano writing. This Ballad is highly energetic, characterized by driving rhythms and percussive, high-octane technical passages.
The primary challenge is maintaining technical precision and clarity during the rapid, percussive octave and chordal sections.
Comparable difficulty and character — good candidates for what to learn next.
Ballad (Op.4) 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 Ballad (Op.4) lasts about 5 minutes.
Ballad (Op.4) 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 Piano Sonata No. 21 'Waldstein' by Ludwig van Beethoven, Wanderer Fantasy in C major by Franz Schubert, Capriccio alla soldatesca by Charles-Valentin Alkan — see the full similar-pieces list on this page.