Pop music is starting to get sort of darker but not in like a deathgrips way more in like in a poser indie mall goth way cause of lorde.
Mainstream metal is starting to have a numetal revival, that genre everyone told you was bad is going to be re explored, wont be as big as it was first time around.
Hipster metal will be like deafhaven shoegazing shit.
EDM will get even bigger and replace hip hop as the teenagers outlet of impotent rebellion, fuck you mom, fuck you dad.
Hip hop will start to stagnate and be less mainstream and there will be a revival of conscious hip hop, you can already see this shit with kanye and kendrick lamar and j cole.
Rock music: error 404
Country music might see some sort of revival in the alt community, they might be more interested in the old timey stuff, and hipsters will put away their prejudices against lower class white way of life