A pretty cool video is making the rounds on the internet this week ... Check out this footage from 2009 - when Mumford & Sons were just getting started and played on the patio of a pizza place during the South By Southwest Festival!     

 

 

 

Here's footage from just a year later - when the band had the entire crowd singing along at the Reading Festival! 

 

 

 

Get tickets for Mumford & Sons Delta Tour when it stops in Washington DC on December 14 HERE