Johann Sebastian Bach's 'A Bach Suite' refers to one of his famous instrumental suites, such as the English Suites, French Suites, or Partitas. These works are characterized by their dance movements, sophisticated counterpoint, and profound musical expression.
Focus on crisp articulation and the clear projection of melodic lines within the contrapuntal texture.
A Bach Suite 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 A Bach Suite lasts about 15 minutes.
A Bach Suite is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.