This is a salon-style waltz composed in a late 19th-century idiomatic style. It highlights graceful melodic turns set over a classic oom-pah-pah accompaniment.
Focus on the left-hand light jump bass technique to ensure the waltz rhythm remains elegant rather than heavy.
Comparable difficulty and character — good candidates for what to learn next.
Blue waltz 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 Blue waltz lasts about 4 minutes.
Blue waltz 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 Canone sulla scala cinese per pianoforte by Marco Ciannella, Belle of the Ball by Leroy Anderson, American Beauty by Joseph Francis Lamb — see the full similar-pieces list on this page.