"Thank you for having us back in your country [and] in your lives." But it was Bono's rendition of One Tree Hill, written after Carroll's death, that hit home for the 40,000-plus crowd. "We sort of adopted him, or perhaps it was the other way round," Bono said. "We were very grateful for his companionship over those precious times. He was taken from us too soon, but in a way he's still very present." The pre-show publicity for The Joshua Tree Tour boasted about it having the largest high-res LED video screen ever used in a touring show. Seeing it up close really makes you appreciate how much effort goes into staging such a monumental performance.