This is pretty interesting. I'm astonished there is no Nirvana or U2 in the canon. I am wondering if looking at sales one year after the song came out, or radi

This is pretty interesting. I'm astonished there is no Nirvana or U2 in the canon. I am wondering if looking at sales one year after the song came out, or radio transmission after a while, would be a stronger predictor of staying power than what peaked at a given time.