44. "No Line on the Horizon"
U2 began work on what would become No Line on the Horizon in 2006 with veteran producer Rick Rubin. But when those sessions proved unsuccessful, they soon returned to their longtime collaborators Daniel Lanois and Brian Eno, traveling to Morocco to began recording as a six-piece band. They nailed the album's pulsating title track – about a "girl, a hole in her heart" – in a single take. "It's very raw and very to the point," the Edge told Rolling Stone. "It's rock & roll 2009." Said Bono, "You could have called this album 'The Pilgrim and His Lack of Progress,' because all the characters are struggling to stay true to their values or want to realize their potential."