Home / Music / When did Mozart finish his Piano Concerto No. 21?Music linernotes album music wolfgang-amadeus-mozartWhen did Mozart finish his Piano Concerto No. 21?He completed it on March 9, 1785, in Vienna, one day after his 20th birthday. Search Amazon As an Amazon Associate I earn from qualifying purchases.Related NotesExploreExploreExplorePrevious When did Mozart finish his Piano Concerto No. 23?Next When did Beethoven's Symphony No. 5 premiere, and what other works were performed alongside it?