Everything about this. The expert use (and choice) of instruments. The production decisions. The remarkable quality of the voices.The surprise near the end. I could watch Walk off the Earth videos all day.
(Note: According to Wikipedia, they’re Canadian, and they’re break-out video was a cover of Gotye’s “Used to Know” where all five of them played the same guitar. Also, those tubes, apparently, are Boomwhackers Tuned Percussion Tubes, and I want them.)