U2 in Chicago

"We really wanted to explore using room ambience, the sound of a room and of musicians playing together in a room, instead of using an artificial sense of space, which was a very common thing earlier in the Eighties. We wanted to try and record in a more naturalistic way, so that you could get the impression of a space, giving the recording a real sense of dimension. Eno was interested in these ideas, so we did do a lot of playing together in a room and recorded it. You can hear it on some of the tracks. It's got a real sound!" - The Edge on The Unforgettable Fire, 1999