Yesterday marked the 20th anniversary of when Jeff Krulik and John Heyn visited the Capital Centre in Washington, DC and interviewed fans hanging out before a Judas Priest concert. What they captured is one of the greatest films in underground film history: Heavy Metal Parking Lot.

Metroblogging DC marked the occasion with an excellent, in-depth interview with Jeff and John, who went on to spawn a mini-franchise of “parking lot” films that include Harry Potter, Neil Diamond and a TV show on the Trio cable network.

If you haven’t seen it, Heavy Metal Parking Lot is one of the greatest music films of all time and it’s now available in a special edition DVD with over three hours of bonus features, including directors’ commentary, sequels & outtakes and more.

And visit the official website for HMPL.