This piece is a highly demanding transcription/original composition focused entirely on the left hand. It is distinctive for its sophisticated polyphonic layering and dense harmonic textures managed by a single hand.
At Henle 7 this is a late-advanced work — the technical demands are serious and sustained. The main demands: a left hand with real melodic or rhythmic responsibility of its own; a true singing tone, with the melody floating above the accompaniment; and chord voicing — bringing out one note inside a handful of others.
Beyond that, expect big chords that need weight without harshness, and rubato that must breathe naturally without losing the pulse.
The primary challenge is maintaining a singing melodic line while executing complex inner-voice accompaniment and wide-reaching arpeggiations in the left hand.
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.
Elegy for the LH is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 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 Elegy for the LH lasts about 6 minutes.
Elegy for the LH 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 Elegy for the Left Hand by Leopold Godowsky, Elegie by Leopold Godowsky, Elegy by Leopold Godowsky — see the full similar-pieces list on this page.