P. Diddy would never stand for it: being chauffeured right up to an arena stage in a long, shiny…station wagon. Yet that’s just how Isaac Hayes makes his majestic appearance in this 30th-anniversary re-release of Wattstax, the film capturing L.A.’s seven-hour 1972 concert commemorating the Watts riots. Hayes’ performance is actually the “lost ending” of the 1973 documentary, a climactic conclusion that had to be cut because of legal concerns. The remainder of the surprisingly slow-paced film is a fascinating time capsule of both art and attitude, with emotional performances by R&B, blues, and gospel acts such as the Staple Singers, Rufus Thomas, and Albert King; a running monologue by Richard Pryor; and interviews with neighborhood residents (including future Love Boat fixture Ted Lange). The topics? Everything from the first time the random subjects heard the word “nigger” to their thoughts on the blues (“can’t nobody give a sister the blues like a man”) and the handshake (“I can go anywhere in the United States of America and see a black man and give him a power shake, and there’s unity there,” attests Lange). The mood is often poignant—a crowd inattentive during “The Star Spangled Banner” passionately sings along to the subsequent “Black National Anthem” with fists in the air—but the interviewees add a touch of levity. During a discussion of interracial dating, for example, a fresh-faced, sweet-voiced young woman says, “The only thing I really don’t like about black men is I don’t understand why they would, uh, prefer white women, or whatever, when there are lots of black women who can do more, you know, than a…a white woman.” Cut to a less hesitant Lange: “Some niggas I know like Chinese women!” The Rev. Jesse Jackson, MC of the show, kicks off the performances with some typically stirring rhetoric, but it’s much more fun to watch his gleeful introduction of Hayes: “He’s a bad…a bad…I’m a preacher, I can’t say it,” Jackson jokes, after which he respectfully removes the singer’s floppy hat and beams at him as if God Himself had fallen to earth. —Tricia Olszewski