Watch Justin Vernon And Members Of The Walkmen Join The National At Primavera Sound '14

During their Primavera Sound set, the National brought some special guests up on stage. Justin Vernon (whose Volcano Choir project also made an appearance at the festival) joined them for “Slow Show” and the Walkmen’s Hamilton Leithauser and Paul Maroon helped out on “Mr. November.” Maroon also stuck around for “Terrible Love.” National frontman Matt