J.C.F. Bach's 'Allegro in G Major' is a charming piece from the Classical era, showcasing clear melodic lines and a balanced structure. It's a fine example of the simpler, more accessible style of the Bach sons.
Focus on light fingerwork and clear articulation to achieve a graceful and sprightly rendition.
Allegro in G Major is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 Allegro in G Major lasts about 4 minutes.
Allegro in G Major is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.