After the colossal meltdown at the Clear Channel-owned iHeart Music Festival three days ago, Green Day front man Billie Joe Armstrong has entered rehab for substance abuse. This is a total PR move as well as the obvious, since Clear Channel pretty much owns radio. The way I see it, if Green Day ever wants another song played on the air, major wound care needs to be performed. There was also an official apology issued.(Photo: Pacific Coast News)