Kowalski's Op. 67 is a heavy, emotionally charged character piece typical of the mid-Romantic era. It relies on intense melodic phrasing and large, dramatic dynamic swings.
At Henle 5 this is a late-intermediate piece — technically substantial, with musical demands to match. The main demands: a true singing tone, with the melody floating above the accompaniment; sharp dynamic and character contrasts held together in one arc; and rubato that must breathe naturally without losing the pulse.
Beyond that, expect careful pedaling — clarity depends on the foot as much as the fingers.
Mastering the control of wide-ranging dynamic swells is crucial for sustaining the piece's melancholic tension.
Comparable difficulty and character — good candidates for what to learn next.
A level or two down with the same spirit — ideal if this piece is still out of reach.
Where this piece's skills lead: slightly harder works making similar technical demands.
Dolor ! (Op.67) 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 Dolor ! (Op.67) lasts about 5 minutes.
Dolor ! (Op.67) 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 Bajeczka by Henri Kowalski, 1.X.1905 by Leoš Janáček, Diamant noir by Mel Bonis — see the full similar-pieces list on this page.