Blue Voyage is a mid-20th-century work that utilizes modernist harmonic intervals and expansive keyboard writing. It creates a dreamlike narrative through shifting chromatic harmonies and non-traditional tonal centers.
The primary hurdle is the management of large, spanning chords that require careful voicing and intelligent pedaling.
Comparable difficulty and character — good candidates for what to learn next.
Blue Voyage (Op. 6) is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 9.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 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 Blue Voyage (Op. 6) lasts about 5 minutes.
Blue Voyage (Op. 6) 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 La cathédrale engloutie by Claude Debussy, Canope by Claude Debussy, Berceuse élégiaque, BV 252a by Ferruccio Busoni — see the full similar-pieces list on this page.