There are actually two Stax Records stories. The first is of the mid-‘60s, when they defined soul music before tragedy and a sudden collapse. The second is of their rise up from those ashes to become a player in the post-Black Power funk era, and of a second, crippling financial controversy. This Samuel L. Jackson-narrated doc, although a little sketchy on some of the details, delivers both stories with vibrant interviews, including label co-founder Jim Stewart and Otis Redding’s wife Zelda. But feel free to skip the history lesson and enjoy the steady stream of rare concert and TV footage starring Redding, Sam and Dave, Isaac Hayes, the Staple Singers, and many soulful more.