They just want what's best, and we're all sort of working together to find whatever works best for them.He looks like a bit of a guru, but he knows what he's looking for and when he's satisfied with what he's got, Osbourne says of Rubin.Recorded last fall, 13 finds Osbourne, guitarist Tony Iommi, bassist Geezer Butler and guest drummer Brad Wilk (of Rage Against the Ma