Even metal mega-stars still get butterflies!  This week's guest on Discover New Music is the LEGENDARY Rob Halford of Judas Priest.  Yes...THAT Rob Halford!  His metal holiness stopped by to chat about the band's 19th album "Invisible Shield."  Breaking rules, taking chances and making metal for the masses is all in a day's work with this latest project that's been four years in the making.  Plus, Rob plays a quick round of Rapid Fire and says "bring 'em on" when it comes to fighting those duck sized horses!