Check out
www.cdbaby.com if you want to check out some new music. They specialize in indie bands so you cant pick up any Linkin Park or anything but they have a really good search engine that can allow you to find bands that are like linkin park in music style, etc. Also they sub-catogorize their alternative section to
Emo
Progressive
Math
Garage
Pop
Punk
ETC................................. You should check the website out, I love it.