It's not surprising at all.

Why do you think he can host the Juno's? Have his own TV special? If all Michael Buble could do is sing, we probably wouldn't know him so well.

The difference between his professional, highly trained, multi-million dollar voice and his fan's (Sam) voice are obvious, but still, the kids got a great voice.

And it confirms the reason we've loved Buble all along--besides his voice--it's his charm. Could he possibly have any more?