U2 were already a big deal in 1984 - 1983's War LP and its global tour, which also spawned the band's well-regarded live album Under a Blood Red Sky, had made the Irish band one of the world's hottest, if not hippest, tickets.
But it was The Unforgettable Fire that pointed the way to the band's record-breaking future as Steve Lillywhite's upfront rock production gave way to Daniel Lanois and Brian Eno's more nuanced soundscapes.