U2 in Copenhagen, 29 September 2018

"Experimenting in rock is at its best when you dream from the perimeters and bring it back to the center. All my favorite innovators disappear into the woods and bring something back, and you get to hear the songs distilled from those experiments. I used "Kid A" as an example, because I love the album. We did our Zooropa we did our Passengers, even our Pop experiment. There were great ideas on that album, but we didn't have the discipline to screw the thing down and turn them into magic pop songs. We'd become progressive rock! Ahhh!" - Bono, 2005