Sometimes a moment can open your eyes to the beauty of everything around you. Listening to Led Zeppelin's album Zoso, I was amazed at the intensity of the guitar at one point in the song--Jimmy Page was really working overtime--and as I leaned forward in my chair to adjust the volume, a police car drove by, its wailing siren exactly in tune and on tempo with the song. Not the same melody, merely a perfect complement, almost a descant by a phantom fifth member of the group. Nobody else listening to that album anywhere else in the world at that moment understood that three second slice of music like I understood it right then.