"Dirty Day is a father and son song. 'It's a dirty day', was an expression my dad would use and there is a lot of him in there but it was also influenced by Charles Bukowski, the great American writer and drinker. The song is about a character who has walked out on his family and, years later, meets the son he's abandoned. It's not about my father but I used some of my dad's attitude in it."
Within a few days of finishing the album, "Red Hill Mining Town" was U2's leading contender for the first single of The Joshua Tree. Then as the weeks went by, views started to change and it became "With or Without You".