This is not very good, but then they obviously had very little to play with. I have compared the three mixes on my main system and also opened up in Audacity and solo'd tracks to compare. It's confused me for years, but last night I listened to it kind of blind (by which I mean I flicked through the audio button on my remote from DTS stream to DTS stream, trying to notice differences, without reminding myself of the options - I last played it 2 years ago).
Mix one has the piano front centre, bass rear left, drums rear right.
Mix two is very, very similar but possibly has a little more reverb.
Mix three has piano FL, bass and drums FR, with reverb in the rears - so a typical 'live' or 'classical' mix.
This fits the descriptions - jazz stage, concert hall, front row. (Though arguably you'd get more reverb in a small jazz club than in a large concert hall.) The mix stays like this until near the end when more instruments/ voices are added but it still doesn't sound too discrete. Anyway, like others, I prefer the jazz mix. It's the most discrete. But it's v difficult to tell from the concert. Overall even the best mix I find rather disappointing. I wonder what is actually on the original 3 track tape. I'm guessing it's not a dry, discrete recording of each of the three main instruments. If that was the case, it would have been easy to create a very simple but very discrete mix. Instead, I assume it's a basically live recording, with each instrument majoring on one of the tracks, but picking up the other two instruments to some extent. If that is the case, I wish they had created a 5.1 which just reformed the actual studio layout, as per the recording. It might have been a strange layout, but surely it would have sounded more realistic. But I'm just guessing.
I also find the sound quality pretty disappointing. It's all a bit fuzzy and mid-range - I want to boost the lows and the highs (though I am not experienced in this area - I do not have an equaliser).
Musically, it's not that Christmassy, so even that disappoints somewhat.
Anyway, I'm still happy to have this disc. The mix is not really very good but they had little to work work. I just think that after all the work that apparently went into it, I was expecting more.
I feel like I'm the Grinch, complaining about this disc, the music is clearly adored by many! I did not grow up watching the TV special every year as seems to be the case with most QQers, so I do not have nostalgia on my side. So I almost didn't bother to write a review. However, I know that with underwhelming mixes like this it is easy to miss subtleties so I feel it's worth mentioning my disappointment in case others can point out things I've missed.