Before the Enlightenment, most composers were supported by the patronage system. That is, they were employed either by the church or the aristocracy....

Before the Enlightenment, most composers were supported by the patronage system.  That is, they were employed either by the church or the aristocracy. During his later years in Vienna, Mozart became one of the first freelance composers. What aspects of his social surroundings allowed for his entrepreneurship and how were these aspects different from the conditions of past eras? In THIS you should include Enlightenment philosophy, the rise of the middle class, and the emergence of public concerts.