This is a niche contemporary salon-style character piece by Frank Zintl. It is distinctive for its use of unexpected harmonic inflections that deviate from traditional tonal expectations.
The primary challenge lies in maintaining consistent articulation throughout the shifting chromatic patterns.
Comparable difficulty and character — good candidates for what to learn next.
'Quints' - Original 'Sour' Version is rated Henle level 2 of 9 — beginner repertoire, roughly ABRSM grades 2–3. In the RCM system it corresponds to about level 3.
You should be comfortable at Henle level 2 — meaning you can already play level 1–2 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 'Quints' - Original 'Sour' Version lasts about 3 minutes.
'Quints' - Original 'Sour' Version 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 12 Variations in E for Piano by Frank Zintl, Bach-bwv-anh-114 by Johann Sebastian Bach, Bach-anh-114 by Johann Sebastian Bach — see the full similar-pieces list on this page.