O'Kelly was a prolific Irish-French composer whose berceuses often exhibit a high level of melodic ornamentation. This piece captures a melancholic, swaying sentiment.
Ensure large reaches are executed softly to avoid percussive accents in the accompaniment.
Comparable difficulty and character — good candidates for what to learn next.
Berceuse (Op.42) 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 Berceuse (Op.42) lasts about 4 minutes.
Berceuse (Op.42) 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 Bertha by Joseph O'Kelly, Au bal by Joseph O'Kelly, Berceuse sur le nom de Gabriel Fauré, M.74 by Maurice Ravel — see the full similar-pieces list on this page.