Know of any good music??

So, I really like MCR, Three Days Grace, Panic! at the Disco, Taking back Sundays, Green Day, 30 Seconds to Mars, Cute is What we Aim For, and bands like that. I love alternative rock (i think rap is crap, sorry) and im open to a lot of stuff when it comes to music. I'm looking for something new (sad maybe, or like, with meaning). So if any of these things apply to you, or a band you like, please tell me about them. It doesnt have to fit all these charatoristics, and even if its only a song, itll really help out alot!! old, new, idc! ;] thanx for the help