This is a salon-style potpourri arrangement of themes from Lecocq's opéra bouffe. It features lighthearted melodies typical of the late 19th-century transcriptions designed for amateur home performance.
Focus on the clean articulation of the light operatic melodies.
Bouquets de mélodies sur 'Le jour et la nuit' is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 Bouquets de mélodies sur 'Le jour et la nuit' lasts about 4 minutes.
Bouquets de mélodies sur 'Le jour et la nuit' is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.