Just fooling around here. It's raw, but you never know, I might be onto something. It could be a thesis for somebody:
Dark ages (up to about 1350)
-- composers: Catholic clergy
-- performers: monks
-- patron: Catholic church
-- audience: Catholics
-- representative music form: The Mass
Renaissance period (1350 to 1550)
-- composers: servant-class professionals and their aristocrat pupils
-- performers: royal and aristocratic amateurs and their servants
-- patron: same as performers
-- audience: same as performers
-- representative music form: dances and fantasia-like pieces
Baroque period (1550 to 1750)
-- composers: servant-class professionals
-- performers: the composer and his hirelings
-- patrons: aristocracy
-- audience: aristocracy
-- representative music form: concerto and concerto grosso
Classical, including Romantic and all that (1750 to 1950)
-- composers: independent, with patron or teaching job
-- performers: professional orchestras and ensembles
-- patrons: aristocracy and beurgeoisie
-- audience: same as patron
-- representative music form: symphony and other sonata-form works
Era of mass entertainment (1950 to present)
-- composers: whoever
-- performers: whoever
-- patrons: capitalists
-- audience: the masses
-- representative music form: same as folk music
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I don't do it for the money, babe. I do it to entertain people.-- Susan Boyle