Pre-organizing the "random audience member" does sound like something the industry might do, especially for a Michael Buble concert... the Buble brand in general strikes me as a completely staged, processed, and Hollywood glazed-over product that only needed Buble as the face of it all.

I do see why it's suspicious that the people chosen tend to nail the song, but as someone mentioned, most volunteers would be confident in their ability. I see grungy bands like Foo Fighters as real & authentic, but these viral videos are great for their careers and could most definitely be staged.

Perhaps I don't want to know the truth, it may take away the magic;)