This is a bright and energetic sonata movement by Mozart, embodying the clarity and grace of the Classical style. The effervescent D major key and lively tempo create a sense of joyful exuberance, showcasing Mozart's melodic genius.
Maintaining a light, agile touch and precise articulation in the rapid passagework is crucial for conveying the piece's brilliance.
Allegro in D major is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 6.
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 Allegro in D major lasts about 4 minutes.
Allegro in D major is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.