Rock will never experience anything quite like The Black Parade again. My Chemical Romance’s third album is revered by many who regard it as the greatest — and undoubtedly biggest — emo record of all time. And while some dyed-in-the-wool metal fans have criticized its commercial appeal and over-the-top theatrics, the response to the band’s recent reunion suggests that My Chemical Romance’s legacy has only grown stronger since their 2013 split. Even thrash metal icons such as Gary…