Giraffes

Hometown: Brooklyn, NY
Why they matter: Giraffes' brand of snarling '70s-style rock recalls greats like Led Zeppelin, Thin Lizzy, and Black Sabbath. And they're dangerous live -- known for moshing with the audience, taking shots between songs, and hurling microphones and instruments off stage.
You should know: Lead singer Aaron Lazar has a rare heart condition that once put him into sudden cardiac arrest twice in six hours.