
http://www.michaelbuble.com/
A group called Naturally 7 opened for MB and was an all a capella group with no instruments. Each member of the band performed an instrument only using his mouth. They sang "Broken Wings" and it sounded just like the Mr. Mister original - but with human voices as the instruments. You have to go listen to them if you have iTunes. Or here is their website:
http://www.n7house.de/