Hugo Wehrle's Ballade is a salon-style character piece typical of late 19th-century German piano music. It features an expressive, vocal-style melody supported by arpeggiated textures and harmonic shifts.
The primary challenge is maintaining a seamless singing line over a broken-chord accompaniment while managing rubato.
Comparable difficulty and character — good candidates for what to learn next.
Ballade (Op.5) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
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 Ballade (Op.5) lasts about 4 minutes.
Ballade (Op.5) 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 Ballade by Henri Rosellen, Ballad for the unsung heroes by Maurice Verheul, 'Who Knows?' by Ernest Roland Ball — see the full similar-pieces list on this page.