This Andante from Bach's collection of preludes and fugues is a masterful study in counterpoint and harmonic exploration. Its G minor tonality and flowing melodic lines create a deeply introspective and richly textured sound.
Develop clear independence of voice and precise execution of ornamentation.
Andante in G minor (BWV 969) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 8.
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 Andante in G minor (BWV 969) lasts about 4 minutes.
Andante in G minor (BWV 969) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.