A counterpart of Motown, Stax Records Co. brought America “(Sittin’ on) the Dock of the Bay,” “Soul Man,” “Mr. Big Stuff,” “What A Man,” “In the Midnight Hour” and the “Theme from Shaft.” Now groove to the Southern soul with the smooth style of the Memphis recording company that discovered Otis Redding, Isaac Hayes, Booker T & the M.G.’s, Carla Thomas and the Staple Singers.