GREAT PERFORMANCES' Respect Yourself: The Stax Records Story details the story behind the legendary label that launched soul music greats — from Otis Redding and Isaac Hayes to The Staple Singers and Booker T. & the MGs -- on Wednesday, August 1 at 9 pm (ET) on PBS (check local listings). For more information visit www.pbs.org/gperf Narrated by Samuel L. Jackson, the PBS broadcast coincides with the 50th anniversary of Stax and the relaunch of the label by Concord Music Group. One of ...