DAVID HAJDU'S NEW BOOK bears a weighty, Tocquevillian subtitle — Pop Music in America — in step with its aims but out of step with its tone. He cites a study exhibiting how harmonic complexity and diversity of devices have plummeted precip…

I do know that Google has a Music Timeline, however it's horrendous. It isn't a secret that a number of standard music is unoriginal. In reality, science has proven it: The combos of notes in pop songs have been losing diversity persistent…