Fortunately they put the performances up on iTunes too so we have a reference (including this one, which we encourage you to buy along with last week's - at a buck each they're the cheapest singles you'll ever buy and you'll be supporting the show too). We've spliced the TV audio with the iTunes audio and were blown away by the difference, but we'll let you draw your own conclusions as you can download the comparison yourself (thanks to fair use laws)... you'll probably need iTunes to play it. Moral of the story: if you want to hear the performance verbatim, buy it on iTunes.