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First of all, I'm a huge fan of Russell Watson. Sadly, at the time of the performance (one day after radiation treatment), he does not have the voice we love. I pray he gets it back. Mr Watson looks somewhat scared and is lacking his usual exuberance; the camera angles and programming content add to the somber mood.
The best that can be said is his unmatched perfect ear allows him to create a new voice, but the new voice, though quite good, is not fantastic.