So, I was in Seattle a couple of months ago and saw a DVD in Parsons Guitars that was some sort of Scream Training... not the incomprehensible dirth that you'd normally think of... but just something along the lines of, "channeling your inner rock vocalist" type thing. It had an "Atomic War Bride" type of cover but I can't remember what the thing was called (I should just call Parsons and ask, I suppose... or just order it from them) but does anyone have any recommendations for vocal training aid that would help me take my "clean male tenor vocal suitable for backing harmonies" and help me add "convincingly pull off a Jet or AC/DC vocal in the third set" to my bag of tricks. If I were more comfortable doing this I know we could easily add another full set to our repertoire for cover gigs. Advice?