Bono is already promising a follow-up album to Songs of Innocence, called Songs of Experience, that he'd like to have out as soon as 18 months from now. "We're hoping Songs of Experience will be less about intimacy," says bassist Adam Clayton, "and more about a celebration of sorts." The band's tentative plans are to take the indoor Songs of Innocence tour outside once the second album comes out. And there's another twist: In 2009, Bono promised that U2 would quickly follow up No Line on the Horizon with a more meditative companion album, Songs of Ascent. There has been no sign of it since, but Bono now sees it as the third part of the trilogy. "Songs of Ascent will come," he promises. "And there are some beautiful songs."

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