This electrifying documentary about the little known 1969 Harlem Music Festival combines the power of music, spirituality, and politics with a chest full of dazzling clips. In no particular order you’ll witness the magic of, Sly and the Family Stone doing the game changer “Everyday People”, David Ruffin riffing on “My Girl,” Gladys Knight and The Pips ripping through “I Heard It Through the Grapevine,” The Edwin Hawkins Singers taking us to heaven with “Oh Happy Days”, The Fifth Dimension tickling us with the “Aquarius/Let the Sunshine” medley and Mavis Staples duetting with Mahalia Jackson.