This is a chorale prelude by J.S. Bach, based on a well-known hymn tune. It showcases Bach's masterful contrapuntal writing and his ability to imbue simple melodies with profound expression.
Carefully articulate each voice to ensure clarity and balance in the polyphonic texture.
'Werde munter, mein Gemüte' is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 4.
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 'Werde munter, mein Gemüte' lasts about 2.5 minutes.
'Werde munter, mein Gemüte' is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.