They Might Be Giants has been going strong for nearly thirty years now, and just last week released their fifteenth album, Join Us. To celebrate, the band stopped by "Late Night with Jimmy Fallon" on Wenesday night and powered through the the album's lead single, "Can't Keep Johnny Down". It's a wonderfully brief burst of simple, perfect pop, not unlike some other of TMBG's finest moments. For example, their classic surreal 1990 single "Birdhouse In Your Soul", which they performed in a web-only clip for the show. Enjoy both videos below."Can't Keep Johnny Down"