"A study of music from the '50 to the present using the Million Song Dataset has concluded that modern music has less variation than older music and songs today are, on average, 9dB louder than 50 years ago. Almost all music uses just 10 chords, but the way these are used together has changed, leading to fewer types of transitions being used. Variation in timbre has also reduced over the past decades."
via Slashdot
