Guns N Roses is a rock band that originated in California in 1985, with Axl Rose as lead singer and the legendary Slash as lead guitarist. Apparently the band is still active (though Axl is the only original member), but I haven't heard anything new about them...well, ever.
Anyway, they have some pretty cool music. Theirs is probably the hardest music that I've listened to and actually enjoyed. Axl Rose has this incredible screamy voice that I really can't describe, but love. They are also responsible for my favorite song of all time, Sweet Child O Mine.
Here's a taste of some of their other music.
Check out their website.