Well, Country music never gets played on my radio so I don't have to change it, but beleive me that is only eclipsed by bible thumper music.
As for music that gets played on channels I listen to, Nickelback, Creed, Nirvana, Foo Fighters, Styx, or any crap that got the shit played out of it. I have always liked Metalica, and Ozzy, but I've heard their music way too much, same goes for Tool, blah.
I enjoy my Darude channel on Pandora, and Ke$ha, and Limp Bizkit, and some other embarassing stuff, lol.