I’ve seen the MTV VMA’s performance. In which I am not sure whether it’s the recording, the microphone, or just Plain Chris Martin whom sounds slightly squeak-ish and nervous sounding at three parts of the song. It gets better but it doesn’t offset the those noticeable squeaks of the voice.
The performance on Jimmy Kimmel Live seems to suffer the same voice blemish afore mentioned, yet it’s a bit of a more lively performance as opposed to the MTV VMAs.
The one that’s on the money is the one done in Amsterdam (oh joy!) at the Paradiso. I believe that this is due to the fact that the it’s an old church and that the album was recorded inside various churches. Thus rendering the sound akin to that on the album: