No matter how you spin Joe Berlinger and Bruce Sinofsky's chronicle of headbangers on the couch, it sounds like a pitch-perfect parody in "Beyond Spinal Tap" mode. If anything, knowing it's no joke makes it harder
not to giggle snicker at the thought of middle-aged multimillionaires in Hell's Angels drag trying to rekindle their creativity by hiring a $40,000-per-month therapist/performance-enhancement coach to help them parse how they feel
. Sinofsky and Berlinger, whose industrial documentaries subsidize their less commercial projects, signed on to make a promotional film about the creation of Metallica's first studio album in six years. The project me...