I know very little about metal, even though I admire several bands.
What I know for sure, however, is that Anvil - The Story of Anvil is one fantastic documentary about two amazing guys who have never jettisoned their dreams.
Long admired, imitated, and ignored by record companies, Sacha Gervasi's film gives us a potted history of the band, then rides shotgun with them as they tour Europe and record their thirteenth album, This Is Thirteen (a really great piece of work, by the way!) with ace producer Chris Tsangaridis.
Director Gervasi was a roadie for the band in the 80's and clearly gained the confidence of band toppers Steve Kudlow and Robb Reiner (two of the most decent human beings you could ever hope to meet). The raw emotions on display here are a revelation to behold.
Don't read my bullshit about the film. Let the film, which is enthralling, heartbreaking, honest cinema, do the talking.