The story of avant-garde trought the age medieval and renaissance until baroque

For some avant-garde started whit Stravinsky or Schoenberg, but we learn trought ancient medieval and renaissance vocal music that avant-garde existed before these guys. The first revolutional music was introduce by Leonin and Pérotin , than we have to wait for someone like guillaume de Machaut to revolutionized music again, also philippe de Vitry is in the same league as Machaut. Than we have to wait for a guy iike Nicolas Gombert for pushing the limit of what has been done by vocal music [...]