Letterman has been doing a pretty good job of spotlighting the indie rock scene lately, maybe he’s trying to catch up with Fallon’s great taste in musical guests. On Monday he had Fanfarlo on for their network television debut and last night his musical guest was Mumford & Sons who were also making their network television debut. The group played “Little Lion Man” off their debut album Sigh No More and of course had to edit the lyrics a little bit.