Google has compiled the last 64 years of musical history in a large, rainbow-colored chart for both education and the hope that you might buy some of it on the companys store. Today Googles Research group put out a new project called Music Timeline that tracks the popularity of musical genres dating all the way back to 1950. No classical music, but theres a reason Instead of tapping Billboard charts, Google says the data is derived from artist and album information compiled from its Google Play Music service.