What’s a leather-clad, metalhead chick doing at Bruno Mars’ 24K Magic concert? Easy. The man’s pure gold—24 karats of it, to be exact. It all started back in 2010 when I first heard Grenade. One minute I was headbanging to heavy riffs, next thing you know, I was scream-singing “I’d catch a grenade for ya!” like I’d just been personally wronged. The melody? Insanely catchy. The lyrics? Surprisingly deep. And Bruno? Let’s just say the man didn’t just bring vocals—he brought the gospel. His high, crystal-clear notes soared above the sea of auto-tuned synth-pop and smacked me right in my musical soul. So yes, this metal chick showed up—eyeliner sharp,…