The summer of 2013 was supposed to be a triumphant one for Mumford & Sons.  The band booked several shows that quickly sold out and landed headlining slots at several prestigious music festivals.

But, a blood clot on the surface of bassist Ted Dwane's brain was discovered in June.  Dwane needed surgery and would be sidelined.  The band cancelled their headlining gigs at Bonnaroo and Telluride.  They postponed a handful of other concerts.

Mumford & Sons were slated to close out the Glastonbury Festival in their home country of England on Sunday, June 30.  It was less than three weeks after Dwane's blood clot was revealed.

Sunday night, the British folk band took the stage at Glastonbury.  Rolling Stone said it was an emotional set that had frontman Marcus Mumford on the verge of tears at times.

There were two references to Dwane's blood clot on the stage.  He wore a hat to cover a scar.  Also, Mumford asked the crowd, "Also, Ted’s f*cking alive, isn’t he?"

Mumford & Sons ended their set with a cover of The Beatles' Help From My Friends.  For the song, the band had a little help from their friends as they were joined by Vampire Weekend, The Vaccines and a few others.