"O Holy Night" performed on 3 theremins and guitar, by a fantastic group called The Lothars, out of Boston. They treat their theremins with effects pedals, as if they didn't sound strange enough. Lots of mp3s on their site that Stereolab fans should pounce on if they know what's good for 'em. ODing on holiday music? Check out "Bleep-Bloop." You'll be glad you did.