Plot: With Paranoid celebrating its 40th anniversary this year, the Classic Albums/Black Sabbath episode is particularly timely. Music buffs will relish at the 97-minute DVD that touches upon everything from Black Sabbath’s influences, the songwriting process behind tracks like “War Pigs and “Iron Man,” the band’s introduction into America, and even hands-on explanations of the riff work from Tony Iommi and Geezer Butler