This is one of the prettiest Christmas carols I know, and I love the effect even when performed in two very different styles.
Lo, How a Rose E’er Blooming
It’s a very old song, and it’s a toss up whether the traditional feel is better conveyed by a sweet and ethereal children’s choir or a costumed madrigal group.
Pete Seeger sings by himself, accompanied by a banjo. When you click through, choose track 10 and a new window will pop up to play the song.
Either style reinforces the improbability of the event the song describes: a flower that blooms in the winter.
Lo, how a Rose e’er blooming
from tender stem hath sprung!
Of Jesse’s lineage coming,
as those of old have sung.
It came, a floweret bright,
amid the cold of winter,
when half spent was the night.
Ann Marie Gamble 
Kind of wish I could hear it, though I’m not one for x-mas music. In this area, maybe more like the Pogues “New York” song. But I dig Loreena McKennit’s seasonal stuff.