Mullen’s piece is an accessible salon waltz reflecting the popular musical trends of the mid-19th century. It is musically simple and relies on repetitive, pleasing motifs that evoke a summer atmosphere.
Ensure the waltz rhythm remains steady while allowing for natural phrasing within the melodic line.
Comparable difficulty and character — good candidates for what to learn next.
Brises d'été is rated Henle level 2 of 9 — beginner repertoire, roughly ABRSM grades 2–3. In the RCM system it corresponds to about level 2.
You should be comfortable at Henle level 2 — meaning you can already play level 1–2 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 Brises d'été lasts about 3 minutes.
Brises d'été 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 Für Elise by Ludwig van Beethoven, 'O marenariello by Salvatore Gambardella, Butterfly Lovers by Shuwen Zhang — see the full similar-pieces list on this page.