A producer who worked on U2's newest album told talkRADIO of how it had been like a "relay race."
The Irish band's latest record, Songs of Experience, has won rave reviews from critics across the world.
Steve Lillywhite CBE - who produced world-famous Christmas song Fairytale of New York - was one of nine producers who worked with Bono and the other members to produce the album.
He told Mike Graham about the experience of it: "It was a long process, it's a lot like a relay race.
"On this album, there was a lot of work done where the band weren't playing together. It was all done in various studios around the world.
"The songs were sounding great, but there was talk in the band of it not sounding like them.
"My part of the relay race was to make it sound like U2. They brought me in to strip them down to basics.
"The whole idea on the album was to marry the old and the new."