Black Sabbath are considered the founders of heavy metal, but singer  tells CNN in a new interview (watch above) that he doesn't particularly connect with that label.

"I have never ever ever been able to attach myself to the word 'heavy metal' — it has no musical connotations," says Osbourne. "If it was heavy rock, I could get that, but the '70s was kind of like a bluesy thing, the '80s was kind of bubblegum-frosted hair, multicolored clothes and the '90s was kind of grungy. People come up to me and say, 'Your Sabbath work was a big influence on me.' I could go, 'Oh, yeah, I can see that,' but other bands... what part of that is inspired by us? Some of it is just angry people screaming down a microphone!"

One of the obstacles the band had to overcome in recording '13' was guitarist Tony Iommi being diagnosed with cancer. Butler talked about his bandmate's battle. "He was an inspiration to us during the album. Nothing would stand in his way. He just got on with it and through it and I thought if he can do that then I can do that so we persevered with it."

'13' has been a smashing success, topping the Billboard album chart in its debut week, the first time Black Sabbath have claimed the top spot in the U.S. It sold an impressive 155,000 copies, showing the band still has a large fan base.