Pentatonix Christmas Album. I LOVE acupella music. I grew up in a Mennonite Church in small town Montana where there were/are masters of acupella music disguised as farmers and farmers wives. This is where my love for four part harmony began.
Sarah McLachlan's Wintersong is another album I listen to a lot. Here is my favorite song from that album. It's not a traditional Christmas music, but something about it makes me hit repeat.