The Boston-Waltz was a popular ballroom dance style in the late 19th century characterized by slower, more flowing movements than the traditional Viennese waltz. This solo piano version captures the salon-music aesthetic of that era.
Maintain a smooth, lyrical line that flows over the accompaniment without allowing the waltz rhythm to become too rigid.
Comparable difficulty and character — good candidates for what to learn next.
Boston-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 Boston-Waltz lasts about 4 minutes.
Boston-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 Waltz No. 2 by Dmitri Shostakovich, Waltz in C-sharp minor, No. 2 by Frédéric Chopin, Belle of the Ball by Leroy Anderson — see the full similar-pieces list on this page.