Is this one of the most underrated performances of the entire show? This, along with Cher Lloyd's 'Stay with me' are my standout performances of series 7, and two of the most best from the entire programme in my opinion. I actually preferred her's to the original version.

https://www.youtube.com/watch?v=jxyzpdBztYY

Not sure about best but I remember that it took me by surprise at the time.