This is a variant title for the concert waltz by Eduard Holst. It represents typical salon repertoire designed to showcase the performer's facility through virtuosic passagework and singing melodies.
At Henle 5 this is a late-intermediate piece — technically substantial, with musical demands to match. The main demands: a waltz lilt that needs charm and a flexible left hand; sweeping arpeggio figures that must stay smooth across positions; and a true singing tone, with the melody floating above the accompaniment.
Beyond that, expect fast passage work that stays light and even at tempo.
Managing the large-span accompaniment while maintaining a cantabile melody is the essential technical challenge.
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.
Diana: Grand Valse de Concert for Pianoforte is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Diana: Grand Valse de Concert for Pianoforte lasts about 6 minutes.
Diana: Grand Valse de Concert for Pianoforte 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 Diana, Grand Valse de Concert by Eduard Holst, Dance of the Demon by Eduard Holst, Demon of the Wood by Eduard Holst — see the full similar-pieces list on this page.