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. In stark contrast to the band’s self-titled debut album (recorded over two days and mixed in one), Paranoid was allowed an opportunity to be crafted in more accommodating studio environment. Those sessions bore a variety of intriguing stories, specifically one that details how “Paranoid” was written off-the-cuff after executives requested a “short song.”