Although clearly staged (they just happened to have iPhone cables, going into a small mixer, into a battery powered amp, on a subway, with 3 or 4 people recording? Doubt it.) this is a pretty cool song performed entirely on iPhones and shot from multiple angles on iPhones as well. I wonder how long it took them to find two subway stations far enough apart to play the whole song without a stop interrupting them.
And how long before Apple either buys this, or shoots their own slicker version?