"Carol of the Bells" is a traditional Christmas song. Popular recent versions include those done by the Trans-Siberian Orchestra, South Park and in the film Home Alone as arranged by John Williams. Jennifer Hudson performed the song with a group of woodland animals in Elmo's Christmas Countdown. In 2009, the song was also performed by Beaker, The Swedish Chef, and Animal in a viral video. The trio previously collaborated as the Leprechaun Brothers.