"Not as clean as her performance on The Late Show with David Letterman"... ? Really? Wow. I can't see this video, but I did see the Letterman performance. She was flat for the beginning of the song and her voice was extremely tight . She failed to make it back to the microphone in time after doing her dance routine. She was noticeably awkward. So if this was "not as clean" as that one then that's not a good sign. I have seen her perform live and she is quite a good vocalist. She has a lot of potential but she's definitely going to have to get a hold of those nerves and work on her stage presence if she wants to win audiences with her television appearances.