Symphony, K. 45a (Mozart) implies that K. 45a was composed by Wolfgang during their stay in The Hague, possibly for the inauguration of William V, Prince of Orange on 11 March 1766. The Mozarts then took the symphony along with them on their journeys; Wolfgang revised the symphony along the way by making a few changes, especially in the inner voices. Symphony, K. 45a (Mozart) The Symphony in G major "Old Lambach", K. Anh. 221/45a, was probably written by Wolfgang Amadeus Mozart during 1766 in The Hague and revised in 1767. Both versions – the original and the revision – have survived. The symphony
Wolfgang Amadeus Mozart his father was pursuing opportunities of employment for him in Salzburg. With the support of the local nobility, Mozart was offered a post as court organist and concertmaster. The annual salary was 450 florins, but he was reluctant to accept. By that time, relations between Grimm and Mozart had cooled, and Mozart moved out. After leaving Paris in September 1778 for Strasbourg, he lingered in Mannheim and Munich, still hoping to obtain an appointment outside Salzburg. In Munich, he again encountered Aloysia, now a very successful singer, but she was no longer interested in him. Mozart finally returned to Salzburg