What we have here is a heavy metal Disney tune sung by Tom Selleck, as Dave Letterman plays drums. Or not. Last night, Dave Grohl guest-hosted the TV show Jimmy Kimmel Live, dressed in his Halloween costume as Letterman. His guest Kristen Bell was Tom Selleck/Thomas Magnum, complete with chest hair. They both have daughters who are big fans of the movie Frozen, so they performed the song "Do You Want to Build a Snowman" mashed up with Metallica's "Enter Sandman."
The band was appropriately dressed for the occasion as various musicians. A good time was had by all. You can see more clips from the show at Laughing Squid.