Wow, the same exact thing happened to me while I was driving to a show at the PNC Arts Center on a Jersey Highway. I was listening to Opeth's "The Grand Conjuration" and there was a raging thunderstorm that was in perfect synchronization with the heavy riffing parts of the song. It was very cool, but the lightning was so intense and close that it was nearly impossible to drive over 30 MPH on the highway.