An electronic music duo that, if you believe them, weren't meant to be a band. Supposedly, their song Alice Practice (which happens to have an amazingly beautiful and totally unexpected melody with soul-wrenching indiscernible vocals), is really just Alice practicing. I think they said once that they used a keyboard with a nintendo soundcard. The two members are Claudio and Alice, and although they aren't signed yet, they should be. They're named after She-ra's home, NOT crystal meth (which is what I thought at first.) You can find all their music on myspace or limewire.
I just listened to Crystal Castles for about an hour and I think my life is complete.