What band got Metallica‘s James Hetfield and Judas Priest‘s Rob Halford as their side stage audience at a recent Norwegian festival? That would be Turnstile, whose energetic performances have won over fans everywhere in recent years. And now you can count Hetfield and Halford among those seeming to thoroughly enjoy watching the buzzy rockers. It’s the ultimate compliment for a young band such as Turnstile to have drawn what amounts to metal royalty carving out time in their schedule to see what the Brendan Yates-led band is all about. In this particular video shared by Turnstile and also poste…