They formed more than 30 years ago, have been releasing records almost as long, and still today they appeal to just about everyone, from mums and dads to teenage NME readers - a journal whose cover they have uniquely graced in each of their four decades as a group.
It is no exaggeration to say that U2 are the first rock band ever to have remained both a commercial and critical success story across such an enormous timeframe, yet by the mid-1990s the game was almost up; the group were considering a split, having lost credibility, much of their fan base and most of their enthusiasm.
This film tells the story of the massive regeneration of U2 during the new millennium. Across two stunning and classic albums, a world tour to accompany each, numerous side projects and a fresh attitude that not only drew the old fans back in droves, but equally attracted huge swathes of new devotees, the "noughties" was just as much U2's decade as the eighties had been.