Bach's 'Fuga sopra il Magnificat' BWV 733 is a masterful organ fugue demonstrating intricate contrapuntal writing. Its genius lies in the logical and ingenious development of the Magnificat theme through complex imitation.
The primary challenge is to maintain clear voice leading and precise articulation in each contrapuntal line.
'Fuga sopra il Magnificat (BWV 733) is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above. In the RCM system it corresponds to about level 9.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 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 'Fuga sopra il Magnificat (BWV 733) lasts about 4 minutes.
'Fuga sopra il Magnificat (BWV 733) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.