Katzenjammer

Hometown: Oslo, Norway
Why they matter: Four ladies who thrash banjos, pluck fiddles, and bang marching drums, garbage cans, and cookie jars (!) like Appalachian witches drunk on White Lightning. If their live set is as raucous and fun as their sound, prepare for a crazed Bonnaroo hootenanny.
You should know: The word "katzenjammer" is German, meaning "discordant sound" -- and is also sometimes used to indicate a general state of depression or bewilderment.