This is a quintessential late-19th-century salon piece intended to evoke choral textures through piano writing. It is characterized by lyrical melodies supported by arpeggiated accompaniments.
The challenge is achieving a seamless, vocal quality in the melody line while keeping the accompaniment light.
Comparable difficulty and character — good candidates for what to learn next.
Cathedral Voices is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 Cathedral Voices lasts about 3 minutes.
Cathedral Voices 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 'Neath Hawaiian Skies by Charles Arthur Rawlings, Beautiful Star of Heaven by Louis A. Drumheller, Für Elise by Ludwig van Beethoven — see the full similar-pieces list on this page.