To celebrate the 20th anniversary of “Almost Famous” (2000), Be Reel looks back at an era-jumping bunch of music movies about fictional bands. This week, it’s “That Thing You Do!” (1996), “Dreamgirls” (2006), “Rock Star” (2001) and, of course, Cameron Crowe’s aforementioned neo-classic about 15-year-old Rolling Stone writer William Miller coming of age in a tour bus. So hop on, and let’s zoom to the top of those completely fabricated charts!