Grünfeld was famous for his virtuosic transcriptions and parlor pieces, and this waltz exemplifies the late Romantic flair for light-hearted, dance-inspired piano music. It is a brilliant display piece designed to charm an audience with rhythmic grace.
At Henle 8 this is concert repertoire: professional-level technique is the entry ticket. The main demands: a waltz lilt that needs charm and a flexible left hand; rubato that must breathe naturally without losing the pulse; and big chords that need weight without harshness.
Beyond that, expect wide stretches that reward larger hands and clever redistribution.
The performer must master the flexible, Viennese-style rubato while executing large, wide-spread chords.
Comparable difficulty and character — good candidates for what to learn next.
A level or two down with the same spirit — ideal if this piece is still out of reach.
Where this piece's skills lead: slightly harder works making similar technical demands.
Lesser-known works by the same hand, at a comparable level.
Delirien Walzer (Op.63) is rated Henle level 8 of 9 — concert repertoire, roughly diploma level. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 8 — meaning you can already play level 7–8 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 Delirien Walzer (Op.63) lasts about 7 minutes.
Delirien Walzer (Op.63) 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 Italian Concerto in F major by Johann Sebastian Bach, Waltz in A-flat major by Frédéric Chopin, Concert Paraphrase on J. Strauss's 'Die Fledermaus' by Leopold Godowsky — see the full similar-pieces list on this page.