Coldplay - "God put a smile upon your face"
"When we came to record it in the studio, we struggled because there was something not quite right about it. I wasn't happy about where we'd left it and where we were happy to leave it. We couldn't put a finger on what it was so it was really a nice day when I was trying to record bass at the time, and me and Chris were sitting down trying to brainstorm it to find what was wrong. And so I just started to do some bass lines and between the two of us we came up with this kind of groove which stays on the same note as opposed to changing. It gave a lot of bounce to the song and made it roll along in a much more fluid way; it was a bit mechanical beforehand. And it's just interesting that something small like that can really change the whole vibe of a song. And it really nice because from then on it became one of our favourite tracks and it almost did not get on the record. It's now one of our favourite tracks."