It's all about synergy, folks. At least, it is when it comes this post of She & Him performing "Rockin' Around the Christmas Tree" live on The Ellen Degeneres Show. You see, the duo of Zooey Deschanel and M. Ward recently released their holidays album, A Very She & Him Christmas, so this served as a means of promoting the project. But it was also a good move for Ellen, whose show is in the midst of a "12 Days of Christmas" series. See? Win-win. Wait, no. It's a win-win-win, because this is pretty great/cute. Watch the performance below.