Demons by Matvey Bernard is a sombre, lyrical character piece from the Russian school, utilizing minor key textures to convey a sense of foreboding. It focuses on melodic depth rather than virtuosic display.
At Henle 4 this is an intermediate piece that expects secure technique and real attention to phrasing. The main demands: chord voicing — bringing out one note inside a handful of others; a true singing tone, with the melody floating above the accompaniment; and rubato that must breathe naturally without losing the pulse.
Focus on voicing the melody clearly above the darker, oscillating accompaniment textures.
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.
Demons 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 Demons lasts about 3 minutes.
Demons 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 Gymnopédie No. 1 by Erik Satie, Gymnopédie No. 3 by Erik Satie, Cortège by Lili Boulanger — see the full similar-pieces list on this page.