Wave your hands in the air if you were ever at a party that featured a Soul Train line. You know: Folks line up on either side of the dance floor, and then a couple or solo dancer busts a move down the center. All of those memories will flood back like a pair of high-water pants from the '70s when you watch the VH1 Rock Docs 90-minute special Soul Train: The Hippest Trip in America. Don Cornelius, left, the show's host, started the Train 40 years ago in Chicago when mainstream programs like American Bandstand wouldn't routinely have black dancers or artists. It was on the air until 2006 and in reruns until 2008. The documentary is narrated by singer/actor Terrence Howard and features chats with Cornelius and soul stars Aretha Franklin, Chaka Khan, Sly Stone and Snoop Dogg. The peace, love and soul premieres at 9:30 tonight on VH1.