These chorale settings by Bach are foundational works in the Western musical tradition, known for their exquisite contrapuntal textures and profound harmonic depth. They are valued for their clear expression of faith and musical craftsmanship.
Emphasize clear voice leading and precise articulation to bring out the contrapuntal lines.
135 Chorales is rated Henle level 2 of 9 — beginner repertoire, roughly ABRSM grades 2–3. In the RCM system it corresponds to about level 2.
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.
135 Chorales is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.