Musical Advent Calendar: Day Five

Y'all know how much I love acapella. I'm so excited that NBC is bringing back The Sing-Off this year! Just in time for me to be out of town and away from all civilization. Of course! But the great acapella band Under the Influence has released a new Christmas album this year with a few fun guest artists, so today I offer you a few tracks.

Under the Influence f/Otis Redding -- Merry Christmas Baby
Under the Influence f/Paul McCartney -- Wonderful Christmastime

Bonus track:

Under the Influence -- Amazing Grace

It's not strictly a Christmas song, but I know it's a favorite of a lot of people, and it's a nice version, so I'll include it here.