This chorale setting by Bach is known for its clear and devotional character, exploring variations on the hymn tune. It offers a beautiful example of Bach's contrapuntal mastery.
The focus is on maintaining rhythmic precision and achieving a balanced, singing tone throughout the varied textures.
Allein zu dir, Herr Jesu Christ (BWV 261) 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 Allein zu dir, Herr Jesu Christ (BWV 261) lasts about 1.5 minutes.
Allein zu dir, Herr Jesu Christ (BWV 261) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.