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How Four Utah Dads Quit Their Day Jobs to Make Millions / Entrepreneur

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Perched high atop the Great Wall of China, decked out in black-and-white Karate uniforms, two middle-aged dads from Utah -- one on piano, one on cello -- are jamming out to a musical mashup of Chopin and a cut from the Kung Fu Panda soundtrack.

Banging their instruments blissfully as an ethereal fog descends around them, the performance, which is part hokey, part magical, has been viewed on YouTube more than 10 million times.

And it's just one of many stunning stagings to be found on the channel of YouTube supergroup The Piano Guys -- four Mormon dads from Utah who quit their day jobs three years ago in pursuit of an online career that has already netted them millions.