Paper Crows - Build

Here's another clever use of Youtube videos from the musicians, Paper Crows for their new album 'build.'  The site shows four separate YouTube videos which are then synchronized into one coherent visual track using the Youtube API.  Each of the videos is actually a different music track, so users can change the audio track by rolling over one of the videos.  Simple, but very clever.  Check it out here, or see the screen capture below.
via Bobby Nolla