Mozart was a composer.
The actual "day" is not known ... and Mozart is dead! He was about 4 years old when he composed his first work.
Leopold Mozart, who was his father.
Mozart did not compose such a work.
Mozart wrote most of his music for the king, because Mozart that was Mozart's job. Often for himself (he was a very fine pianist) although he also wrote commissions for other pianists.
Mozart's mother, Anna Maria Mozart, was primarily a homemaker and mother who raised her children, including Wolfgang Amadeus Mozart and his sister, Nannerl. She played a supportive role in her children's early musical education and often traveled with them during their concert tours. Although she did not have a formal job outside the home, her influence and encouragement were crucial to Mozart's development as a composer and musician.
In the movie "Amadeus", Mozart's wife brings Salieri samples of her husband's work to submit for a teaching position. Mozart is too proud to give a sample for he feels he should have been offered the position without them. Desperate for money, Mozart's wife goes behind her husband's back to submit him for the job.
Austria (Salzburg).
Austria salzburg
I think in 102939
The Imperial Italian opera company paid Mozart 450 florins for the work.
In his earlier years, Mozart worked for the Archbishop of Salzburg as the court composer. He did some work for the Emperor later, but worked mostly for himself composing, playing and teaching.