"I remember the moment I first saw the stage, it was jaw-dropping to see it standing in the stadium in Barcelona. It also turned out to be a dream to work with because the sound in the stadiums was always way better than we'd been able to achieve in the past."
- The Edge on the 360 tour
Volcano was a last minute addition to the Songs Of Innocence album. It was only added to the album after it was already sent to Apple for the surprise release.