What Is U2's Signature Song?

Few bands have pursued grandeur as relentlessly as U2. Across nearly five decades, the Irish quartet has transformed political urgency, spiritual yearning, romantic conflict, and unabashed optimism into some of the biggest rock songs ever recorded. We trace their journey from the martial intensity of War to the stadium transcendence of The Unforgettable Fire, the emotional sweep of The Joshua Tree, and the polished uplift of All That You Can't Leave Behind. Along the way, we discuss delay pedals, humanitarianism, giant sunglasses, unwanted iTunes albums, and the fine line between inspiring and corny. Which song best captures everything the world loves, respects, and occasionally mocks about U2?