Wow. This is really cool. My ex-boss sent this to me.
The basic premise of the Black Cab Sessions is that the band (or part of it) drives around in the back of a London cab playing an acoustic version of a song in one take. I think that if a song can still come through in these circumstances, you've got a good one.
The Walkmen (I don't know if Hamilton looks bores, scared or stoned)
The Cool Kids (with the, literally, fist bumpin' beat)