Linear Music

Given the number of wine bottles required to pull this stunt off, perhaps I should have filed this under wine tasting, but music will have to do. If I had been asked, I wouldn't have thought that your average in-line skating expert would have picked Mozart to realize in this manner, but I'd have been wrong. Perhaps this was in Germany?

All I can say is "WOW!" How long did it take to tune all of those bottles? Are they all filled with water? How much experimentation was required to get the "clappers" on the skates to have the correct tension so that they didn't knock the bottles over, or did they glue all of the bottles to the pavement? Will someone next try to perform a piece by Boulez? If they do, how will we know?