"Rick Rubin has a larger looming presence on this album than his 'thank you' deserves. He asked 'Why can't more people cover U2 songs?' And it's because, with all the great sounds and arrangements, you can forget that there isn't a song there."
- Bono on Rubin's influence on Songs of Innocence
During the ZooTV Tour, U2 wanted to play a show in Sarajevo. Due to logistical problems they couldn't play there during that tour so instead they created a video uplink to Sarajevo during most ZooTV shows. On the Popmart Tour, they played their first (and so far only) show in Sarajevo, finally fulfilling that vision.