Well, the most likely candidates after hearing this I would GUESS would be the title track, "Blue Christmas" & "The Christmas song" but that is just a GUESS. I noticed some female backing vocals on "Rockin' little Christmas" but as that song was co-wrotten by Deborah Allen and she is also listed as backing voacls on the album, I'm assuming that it's her instead of Bekka on that one and it really is hard to tell on some of the more rockin' ones as in addition to Bekka & Deborah, Lisa Cochran, Bob Bailey, Bruce Channel, John Wesley Ryles & Harry Stinson are also listed as backing vocals on the album and it doesn't state which song they are on so it makes for tough guessing not to mention the fact that when Kix Brooks & Ronnie Dunn do their harmonizing on top of all of that, I really wouldn't take any of what I've guessed as that good of a guess. I fully admit that I am not that good on such things and this is why I personally wish they would list these things more specifically on the liner notes so I coud pass on the most accurate info I can on such matters when I come across them you know what I mean? Well, sorry for the rant, I just enjoy recordings like this better when these facts are on paper as oppossed to being forced to guess as a fan that's all.
Anyways, I hope this was of some help to you anyways Cristian (and/or anyone else out there interested in this).
John