Harry Rowe Shelley was an American organist and composer, and this work reflects the sentimental, devotional style of turn-of-the-century American salon piano music. It relies heavily on expressive, vocal-like phrasing.
At Henle 4 this is an intermediate piece that expects secure technique and real attention to phrasing. The main demands: a true singing tone, with the melody floating above the accompaniment; chord voicing — bringing out one note inside a handful of others; and careful pedaling — clarity depends on the foot as much as the fingers.
Beyond that, expect rubato that must breathe naturally without losing the pulse.
The main challenge is balancing the lyrical melody against the richer, chordal 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.
Dreaming 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 Dreaming lasts about 4 minutes.
Dreaming 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 Berceuse by Dora Pejačević, Berceuse by York Bowen, Au soir by Joachim Raff — see the full similar-pieces list on this page.