What genres are acoustic guitars in?

I've heard it in just about everything.

Classical

Country

Death metal - Opeth being a great example

hard rock - W.A.S.P. - Sleeping in the fire

metal - Pantera - Cemetery gates - Pantera

pop - that annoying jusitn bieber song i heard on the radio (which one right)

progressive - Black Star - Yngwie Malmsteen

It's how you use an instrument to your advantage getting that particular song you want. True artists will look past the stereotype of ohhh that's a country instrument and make music kind of like that guy Yngwie plays the guitar like a violin the outcome made him a very wealthy man.