It's a week before Christmas, and Christmas music has become so pervasive that Mariah Carey's 1994 song "All I Want for Christmas Is You" just reached No. 9 on the Billboard Hot 100 chart, breaking into the Top 10 for the first time 23 years after its release. (Thanks, Vox.) On Monday's Tonight Show, Jimmy Fallon and the Roots gathered in their musical classroom with Darlene Love and Anna Kendrick to sing one of the songs Carey's hit draws from, Love's 1963 classic "Christmas (Baby Please Come Home)." Instead of Phil Spector's Wall of Sound, Love sings this lo-fi version with acoustic classroom toys and a dinky Casio keyboard. Watch below. Peter Weber