Answer:
In a single word: the Enlightenment.
Step-by-step explanation:
The process of musical secularization, which means a song that is not related to religion or supported by religion, began in the Renaissance but was just with the Enlightenment and the anthropological perspective that music could thrive. Theaters, saloons, royal balls, and other locations were now where music could be heard and appreciate, and not only in the Church.