Skillfully performed. Notes from the band's website:
But I see people playing multiple beer bottles…is that right?
Yes, everyone was in charge of two different notes (with the exception of our fine musician on the floor, who was in charge of three!). While this definitely made things more difficult, it was the only way to have a full-sounding arrangement with the limited head-count.
How did people know when to play?
Each person was handed personalized sheet music to learn their part. Once we practiced enough, we were able to put the sheet music away. For the performance, there were large color-coded pages of sheet music on the wall behind the camera for reference…and when we say large, we mean 5′ x 3′ pages (you can periodically see people peeking up there) See our photos section for a visual.
More at the link.