Clay Aiken is unparalleled as a live performer. Listen to him sing O Holy Night in concert. The video is not a professionally produced one by any means, but his voice overcomes that handicap. At one point he appears to be communicating with one of his sound engineers. Don't let that distract you too much. Its a live show :)
and for those who think that David Archuletta is the second coming or that he is Clay Aiken 2.0, here's David's version.
Here is Josh Groban, for those who think he sets some kind of standard. This is live from the Vatican and a professional production. No really!
and for the hearing impaired, here's Clay's O Holy Night in ASL.
What do you think?