Hungarian Dance No. 5 by Johannes Brahms, played on bottles by The Bottle Boys.
From their description of the video:
For this video we decided that we wanted to challenge ourselves musically. We wanted to play something that would demand us playing really fast and still musically intriguing.
While brainstorming which song to play we found that we had made all too few interpretations of classical pieces of music which can be quite challenging. So we chose one of the most virtuosic pieces of classical music and made a bottle interpretation of it: Brahm’s Hungarian Dance No. 5.
It was quite hard and extremely fun to play, since there are a lot of changes in tempo and dynamics throughout the piece. The most well-known interpretations of it are played by a symphony orchestra lead by a conductor who makes all the interpretational musical decisions. So we had a lot of fun practicing to play this piece as “one mind” like a (bottle) chamber music quartet.