Want to find the heart of rock & roll? You can hear it thundering in Anvil, the Canadian metal band that influenced the likes of Metallica but never hit pay dirt. No wonder lead vocalist Steve "Lips" Kudlow and drummer Robb Reiner are banging heads and egos. Sacha Gervasi's powerhouse doc brings humor and fervent focus to Toronto musicians, supporting their families with day jobs, who won't give up the dream. Ever. Listen to Anvil rip into "Metal on Metal." It's hardcore inspirational.