Originally Posted by MJD
Once pop music always pop music. Symphony and Opera is still pop in my book.
Some of it was pop in its day for the upper classes and some wasn't - big difference between Mozart and Varese. Since then new genres have sprung up and classical music had to be recontextualised.
Another thought ... popular with whom? Classical came from church music and was popular with the upper classes. The peasants at the time would have played folk / indigenous music but you don't hear so much about folk music of the classical period because peasants don't feature so much with historians.