Guitar players the world over idolize Stevie Ray Vaughan. But the guitar player he idolized was his big brother, Jimmie. The Oak Cliff natives are the subject of a new documentary called "From Nowhere: The Story of the Vaughan Brothers," and this week we talk with director Kirby Warnock, who covered the duo from their earliest days through their rise to fame. His film screens Thursday and Friday night at the Texas Theatre, just blocks from where they grew up.