I was wondering why this lesser-known Christmas song was played by both Death Cab for Cutie and Mariah Carey, and it turns out it dates back to Phil Spector's 1963 Christmas album. Here's the wikipedia story of the origination:
"Christmas (Baby Please Come Home)" is a song by Darlene Love from the 1963 Christmas compilation album, A Christmas Gift for You from Phil Spector. The song was written by Phil Spector, along with Jeff Barry and Ellie Greenwich, with the intentions of being sung by Ronnie Spector of The Ronettes. According to Darlene Love, Ronnie Spector was not able to put as much emotion into the song as needed. Instead, Love was brought into the studio to record the song which became a big success over time and one of Darlene Love's signature tunes.
Here's Darlene Love's original:
And here's Ms. Carey: