Organizer Fabio Zaffagnini spent a year planning the massive outdoor event to create the video as a plea to the Foo Fighters to come to Cesena. The clip quickly went viral, racking up 18 million views in just 5 days; it's now been seen more than 25 million times.

"I'll never forget that day that my phone was flooded with texts from friends, all saying "Have you seen this???", "Amazing!", "So insane!" with an anonymous YouTube link attached," says Grohl. "Assuming it was just another "CAT GETTING STUCK IN A PAPER BAG" video, I didn't bite at first, but after the 10,000th message, I clicked the link and was absolutely blown away by what I saw.

"To see so many people put so much time, and effort, and love into making music moved me to tears. And the fact that it was a Foo Fighters song...well...it's hard to put into words how humbled that made me feel. It is without a doubt one of the most beautiful experiences of my entire life. I walked outside, sat on the grass, turned my camera on and immediately responded (in my best broken Italian) "Stiamo arrivando! Prometto!"