Jeff Krulik's "Heavy Metal Parking Lot" is a documentary about an assortment of people gathering for a Judas Priest concert. Lemme tell you, these people are REALLY into the music. I was only a baby at the time that the documentary got made, so I missed this whole era (just as I missed disco, the hippie movement, and doo-wop). Nonetheless, I can say without a doubt that this is some fun stuff. Even if one considers the music corny, the fact remains that it was real music (by contrast, Justin Bieber's "music" is just corporate stuff).
I don't know how available the documentary is on video, but it's available on YouTube.
I don't know how available the documentary is on video, but it's available on YouTube.