Raise your hand if you’ve ever blown air across the mouth of a Coke bottle (in your youth) or beer bottle (in your more mature years, right?) and thought about what a nice tone it produces. Maybe you thought about what you could do with a couple of bottles, and some varying liquid levels.
Whatever you thought, it probably wasn’t quite as complex and creative as what the Bottle Boys came up with.
They were also on Britain’s Got Talent last year. (How does a Danish group perform in Britain’s Got Talent?) Simon Cowell was not impressed, the sourpuss.