As a guest or in the audience?

I like the song by Ellie Goulding.

My guitar teacher sang in the backing group for Bastille, it was really weird seeing him on TV. He was the one in the right backing group, at the far right. It was the second time though, he also sang in the backing group in the Brit Awards for Emili Sande (I think that's how you spell her name).

Wow, less than a day left, like 2 hours left :D, well...