Most metal artists and fans can agree: Sabbath is heavy metal's ground zero. But what was ground zero for Sabbath? The original lineup � Ozzy Osbourne, Tony Iommi, Geezer Butler and Bill Ward � hailed from working class Birmingham, England, in the rubble of World War II. The bleakness of the bombed-out factory town was reflected in their music, and also in that of Judas Priest, who debuted just a few years after Sabbath hit the scene.

Miraculously, both bands are still active today, albeit without all of their classic-era members. Osbourne, Iommi and Butler recently released 13, the first Sabbath studio album to feature Ozzy in 35 years, and it topped charts worldwide. Meanwhile, Judas Priest, with a new guitarist Richie Faulkner has been touring and � as frontman Rob Halford tells Radio.com -- working a new album of their own.