This is insanely cool. Alison Cichowlas and Tony Lam of Google Research:
Today, we’re releasing a visualization to show which music has stood the test of time, and how genres and artists have risen and fallen in popularity. The Music Timeline uses aggregated data from Google Play Music to show the changes in music genres over the decades.
It’s fascinating how some genres ebb and flow, while others are driven almost exclusively by a handful of artists.