10 Weirdest Rock Songs That Became Hits

10. Left Behind - Slipknot

The mainstream charts have always had a bit of a rocky relationship with heavy metal. Even when you had Metallica "selling out" with the Black Album in the '90s, something like Sad But True was still a little too evil for the moms of the world to really approve of. So how did we go from the hard rock version of metal to full on screaming being on the charts just a decade later?

When the nu metal boom first started to take over the world, it felt like Slipknot were supposed to be the cartoon version of that, until Iowa came and blew everything wide open. The thought alone of an album like this selling in the mainstream is unthinkable, let alone inching its way to the top of the album charts. That means there had to be some sort of crossover, right? No...if anything, it seemed to get that much heavier with age.

On the now classic Left Behind, there's barely any melodic singing throughout the entire song, with Corey Taylor shrieking his guts out on almost every single chorus. That was premeditated too, since producer Ross Robinson insisted on getting more gutteral so the entire song hit you like a smack in the face. First we started with Black Sabbath's bluesy take on hard rock, and the '00s opened with one of the heaviest records entering the Billboard charts. Fasten your seatbelts, kiddies. The age of heavy was about to take over the world.