"I don’t even think about it. I just do it. I think Gary [Holt – Slayer’s other guitarist] has a harder vibrato than I do. It’s your own personal style, and how it evolves depends on how much you want to make it sing on its own. It has a lot to do with muscle development and getting calluses at the end of your fingers. When we are rehearsing for tours, we go from working on new material with no leads at all to live show stuff that has lots of leads. Sometimes I have to call time on practice because my fingers are dust; I have to just go home. You’ve got to build up the stamina."