Bach's BWV 58 is a powerful cantata movement, often performed instrumentally, that showcases a poignant and introspective fugal structure. Its emotional depth is conveyed through its intricate voice leading and somber harmonic progression.
Developing independent voice control and understanding the fugal subject's development are key.
Ach Gott, wie manches Herzeleid (BWV 58) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Ach Gott, wie manches Herzeleid (BWV 58) lasts about 5 minutes.
Ach Gott, wie manches Herzeleid (BWV 58) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.