Hans Christian Lumbye's 'Azurine Vals' is a charming and elegant waltz, characteristic of the composer's light and graceful style. It features flowing melodies and a clear, infectious rhythmic pulse.
Focus on maintaining a steady waltz rhythm while allowing for expressive rubato in the melodic lines.
Azurine Vals is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 5.
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 Azurine Vals lasts about 5 minutes.
Azurine Vals is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.