Mars once made a song about loving someone so much that you'd be willing to die for them. That track was called "Grenade," and there's a reason why you don't hear it as much at the mall anymore.

Bruno Mars fans are only just realising where they have heard the song 'APT.' before. The American singer-songwriter, responsible for hits like 'Grenade', 'Locked Out of Heaven', and 'Treasure ...