I love the regular version of "The Holly and the Ivy". Listen to the whole thing -- I was turned off at first by the different melody (since I love the original so much) but after one listen I now appreciate this Irish, tragic, deep interpretation of the song.
It's typical Irish -- sad, deep, melancholic. Thinking of how the holly and the Ivy remind us not just of Jesus' birth, but of His bitter passion and death (the crown of thorns, the gall he tasted on the Cross, the blood he shed, etc.)
So now I love this version.