Sometimes, all it takes for an old group to take on a new wave of fans is a simple change in the act.Disturbed, the Chicago-based heavy metal band that formed as "Brawl" in the mid-90s, has been experiencing a musical renaissance since the release of their newest album, Immortalized, in 2015.Though the album had many triumphs, among the most recognizable was the band's foray into a crossover success that had old and new fans alike lauding them for months afterwards. Their inspiration? Simon & Garfunkel's 1964 chart-topping song "The Sound of Silence.""I couldn’t be more flabbergasted by the whole thing," said lead vocalist David Draiman. "My parents can play [the song] for their friends with pride without having to warn them not to be frightened ahead of time. I have fans saying, 'Finally, me and my mom can actually agree on music for once!'"But why this song? And why the immense popularity that followed?