Bulletproof argument.
God, am I gonna piss off every touchy white liberal by Friday or what? To say that pop and rock account for the majority of mainstream releases is not an outrageous claim. If I left rap out and said in spite of high record sales and critical acclaim, our defining artist couldn't come out of Nashville and just left it at that, you wouldn't care. If rap was more important than rock, why is rap relegated to just a few shelves in the store while rock and manufactured pop have the lion's share?
Yhat's insinuating that pop and rock are one genre though. Fall Out Boy is different from Broken Social Scene, is different from Radiohead, is different from U2, is different from Kelly Clarkson.