K.562a is a brief but sophisticated canon demonstrating Mozart's impeccable sense of voice leading and motivic economy. It is essentially a concise puzzle piece that reveals the composer's wit.
Ensure the light, witty character is maintained through precise, non-legato articulation.
Canon in B-flat major (K.562a) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 5.
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 Canon in B-flat major (K.562a) lasts about 2 minutes.
Canon in B-flat major (K.562a) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.