This is a salon waltz composed by Argentine pianist Enrique Delfino, known for his work in the tango and light music genres. It captures the sentimental and elegant flavor characteristic of early 20th-century Latin American piano miniatures.
At Henle 4 this is an intermediate piece that expects secure technique and real attention to phrasing. The main demands: a waltz lilt that needs charm and a flexible left hand; a true singing tone, with the melody floating above the accompaniment; and a left hand with real melodic or rhythmic responsibility of its own.
Maintain a graceful, consistent waltz-rhythm while balancing the melodic line against a steady accompaniment.
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.
El prisionero is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 4.
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 El prisionero lasts about 3 minutes.
El prisionero 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 Belgique by Enrique Delfino, El rey del cabaret by Enrique Delfino, Body and Soul by Johnny Green — see the full similar-pieces list on this page.