Mozart's "Alleluja" K.165 (from his motet 'Exsultate, jubilate') is a dazzling and virtuosic showpiece, renowned for its brilliant vocal lines and jubilant spirit. Its most striking features are the rapid scalar passages, elaborate ornamentation, and the sheer exuberance of its melodic invention.
Demands excellent dexterity for rapid runs and precise execution of ornamentation with clarity.
Alleluja (K. 165) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
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 Alleluja (K. 165) lasts about 3.5 minutes.
Alleluja (K. 165) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.