Mozart’s Viennese years from 1781 were characterized by a great spirit of reform arising from the revolutions in America and France, an aspiring bourgeoisie and secularisation, along with numerous social reforms under Emperor Joseph. The Age of Enlightenment reached its peak in 1789 with the Declaration of Human and Civil Rights in the French National Assembly. Mozart understood like no other how to capture this social shift in his compositions. He was the most fashionable artist with the Emperor, at the royal court, in bourgeois salons and amongst street musicians. Neither later composers nor the pop icons of today have achieved such popularity among all levels of society.