It's not everyday that you see an artist do something like this for a fan.

During one of his concerts Michael Buble noticed a lady at the front of the stage trying top catch his attention. When first talking to her it seemed as though she was a crazed fan.

Turns out she was just a determined mom wanting Buble to hear her son sing. Buble let the 15 year old Sam Hollyman come on stage and was shocked when he heard the voice that came out of this kid.

Check out the video below:

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