One Direction's fans probably aren't old enough to know the band's 2014 hit song sounds just like Def Leppard's "Pour Some Sugar On Me." However, though the two songs have striking similarities (you can pretty much hum one song on top of the other), Def Leppard said they weren't pursuing legal action. "The One Direction one is very similar in structure, but it’s all good," Def Leppard's guitarist Phil Collen said. It's a good thing the '80s rock band was so cool about the whole thing because, if they'd taken the issue to court, they probably would've won.