I'm looking for some good music?

I'm bored, and tired of listening to the music I have on my mp3 player. If you know of any good bands or songs that you know of, please let me know. I'm into rock, pretty much any type. I don't like country or rap. My favorite band is System of a Down right now, and some other bands I like are Papa Roach, My Chemical Romance, AC/DC, Korn, etc. If you could just list some things, that would be marvelous.