I just came back from a lunch-time carol singing practise session here at work. I brought along my Low D and accompanied the carollers (sp?). It worked really well. The Low D really adds a nice background accompaniment to carol singing. Some of the carols we practiced were:
What a neat idea, to accompany caroling with the low whistle! Just a few to add to your list, although two of these are not commonly sung carols and may not be very singable in D (not sure what key they are usually in):
Some Children See Him
O Come O Come Emmanuel
Huron Carol (Twas in the Moon of Wintertime)
I am doing these three as a set tomorrow on my “Christmas Music on Wacky Instruments” concert 
I’ll second the O Come O Come Emmanuel suggestion. Although I’m Jewish, every time I pick up a low whistle I seem to want to play that gorgeous carol. Our Baroque consort just played a gig in a spectacular church in Troy and while we were warming up I tooted the same carol on my Tenor recorder ( same approx size as a low D) and with the acoustics of that church, surrounded by about 10 genuine Tiffany windows, the effect was moving in the extreme.
I’m not sure Frosty The Snowman counts as a carol!
Every Christmas I get to trot out my claim to Christmas fame. My grandmother used to live opposite the grandson of the man who wrote the tune to “Once In Royal David’s City”, so every year we kids used to sing that one specially for him. Bet he was sick to death of us!
One of my other faves is Silent Night. I used to know it in German, but alas the memory banks have packed up now.
I am currently working on “Do You Hear What I Hear?”
Well, do ya? DO YA? 
Sorry could not help.
I introduce my low d to the folks at choir. They loved it. Prefer it over the high d.
It has a soulful sound to it.
Have fun!
Laura
On 2002-12-10 07:55, Martin Milner wrote:
I’m not sure Frosty The Snowman counts as a carol!
You’re right Martin, but it’s still a nice one to play. Maybe I should have said Christmas songs…
Gerry,
I agree, Low-D’s are great for carols, the ones you listed and a number of others.
One thing I found was there are a couple of carols that actually work as good with a regular (soprano) D. I think “We wish you a merry Christmas”, and “Angels we have heard on High” are a couple that work nice on regular-d. You might want to find a couple of others. I personally prefer, my Overton Low-d’s throaty tenor on carols. If every 6th or 7th song, I can play a soprano D (or C); then, I have a nice change of pace. This is especially nice if I plan to play most of the evening (20-30 carols). I found slipping the occasional High-d in also relaxes my fingers.
Another idea, I want to try this year is that some of the carols have standard high descants or harmonies (Silent Night for example). I’d like to try these on whistles low and high to see how they carry and blend.
I heartily agree that O Come, O Come, Emanuel is a fantastic carol for low-d. For me ornaments, just seem to fall efforlessly into this carol.
It’s also cool that all these songs are so rich with tradition and connection with folks. Connections that ease the open hearts of players, singers, and listeners, and prances between, adding gufaw’s, giggles, joy, and warmth. In awe, I see that glow arise and dance like the nut-cracker’s children from sparkle to twinkle to shine in the eyes of those gathered about. Music’s purpose fullfilled.
Good cheer and …
Enjoy Your Music,
Lee Marsh
[ This Message was edited by: LeeMarsh on 2002-12-10 13:22 ]