Question: Which city in Ventura County is  Ojai Music Festival  been done 
Sentence (from "The Classical Style (opera)"): The opera is inspired by the musicologist and pianist Charles Rosen's 1971 book "The Classical Style" and thus follows composers Wolfgang Amadeus Mozart, Joseph Haydn, and Ludwig van Beethoven as they descend from heaven into a modern-day classical music climate.
Relevant evidence: No