Did you hear the one about Led Zeppelin jamming with Black Sabbath? A new interview with Sabbath guitarist on RollingStone.com reveals that the jam was more than an urban legend.

Black Sabbath were recording at Battersea in London at the time and towards the end of the session, Zeppelin came over to check them out. Zeppelin drummer John Bonham wanted to play Sabbath’s “Supernaut” with the band so the players all got up and jammed. The problem was, Bonham was one of the hardest hitters in rock and Sabbath drummer Bill Ward was paranoid that his precious kid would be destroyed.

“John did get up on one occasion, and broke Bill's kit,” Iommi said. “It was in the early days, and Bill couldn't afford to buy new cymbals and snares. Of course, after that, John would come along, and say, "Can I have a go on your kit, Bill?" And he'd go, ‘No!’”

In the RollingStone.com interview, Iommi also talked about his new book, 'Iron Man: My Journey Through Heaven and Hell,' the possible upcoming reunion of Black Sabbath and was asked what would happen if he, bassist Geezer Butler and Ward tried recording another Sabbath album with Ozzy Osbourne.

“We've moved on since [the days of the original albums]," says Iommi about the possible direction of a new Sabbath disc." I don't know quite what we'd be doing. It would be a Black Sabbath thing, but I don't know to what extent.”

Iommi also reiterated that there may be a full Black Sabbath reunion tour, but again stressed that it’s not a sure thing, adding that all of the members’ individual managers would have to agree on the terms of the reunion.

“It’s not as easy as it was in the old days ,” Iommi said.