Mcfly , Maroon 5 , Linkin Park , Click 5 , Jonas Bro's , Greenday , Westlife , Boyzone . Mostly pop/rock and not forgetting punk as well.
Fall Out boy, PANIC at The Disco, 30 seconds to mars, nickel back, greenday, Linkin Park, Paramore, The Gazette, and many more.
My overall favorite band must be the John Mayer Trio. I bought this dvd titled "Where the light is, Live in Los Angeles", so good I now want to see those guys in concert.
I vote Rock!! N-Sync, Brittany Spears... J/k, I like a variety, but I think I listen to rock most often. For a while I was big in to hiphop and Rap just because it was "cool" where I lived... I got over that pretty quick... I still like some hiphop and Rap, but in general, I don't care for most of it. I mainly like whatever I can connect to in spite of its genre.
I'm actually a pretty big Paramore fan. Their first two albums were great, and a 3rd is being released soon. Also I'd throw Boys Like Girls, and My Chemical Romance in there. Also a couple more babnds, but I could go on and on.