''''Symphony No. 7''' in D major, K. 45, by Wolfgang Amadeus Mozart, was completed in Vienna in January 1768 after the family's return from a visit to Olomouc and Brno in Moravia. The symphony is in four movements. Its first performance was probably at a private concert.Zaslaw, pp. 114–18 The symphony was reworked to become the overture to Mozart's opera, ''La finta semplice'', K. 51, ISMN M-006-20466-3 composed and performed later that year, and the overture itself was subsequently adapted further to create a new symphony, known in the Köchel 1964 (K6) catalogue as K. 46a. The autograph of the score is preserved in the ''Staatsbibliothek Preusischer Kulturbesitz'' in Berlin.