In August 1972, seven years after the Watts riots, the legendary Stax recording label staged a benefit concert in Los Angeles for 90,000 people. As time went by, it became known as the Black Woodstock. Hosted by Rev. Jesse Jackson, it was a veritable "who's who" of gospel, soul and R&B and was a mirror of various aspects of African-American culture. Wattstax, made in 1973 and newly restored, features trenchant commentary from Richard Pryor, performances by Rufus Thomas, the Staple Singers, the Emotions and the Bar-Kays, and includes the grand finale (not seen in the original film) — Isaac Hayes' electrifying "Theme From Shaft."