Ozzy Osbourne and Geezer Butler were on hand Thursday for the world premiere of Black Sabbath's "God Is Dead?" video at what was billed as "A Town Hall Event" at L.A.'s Harmony Gold Preview Center.

Following the showing of the nine-minute clip, which won't be officially released until June 17th, the two took the stage to answer questions from the invited guests, who were mainly journalists. Former Ozzy guitarist Zakk Wylde attended with his kids.

With Ozzy's son Jack as moderator, the two spoke about:

-What it was like to be making new music together again 35 years after their last studio album
-Producer Rick Rubin's role in the making of their new album, 13, which comes out Tuesday
-How guitarist Tony Iommi's battle with lymphoma made Ozzy feel their own problems were small in comparison
-How long it took for Rage Against the Machine drummer Brad Wilk to click with the band after original member Bill Wardopted out of the project over money

Black Sabbath bassist Geezer Butler on how the band and producer Rick Rubin handled the drum situation after Bill Ward refused to take part in recording 13:

B102.7 will air a one hour Black Sabbath '13' Special Sunday (June 9) at 5pm