The story behind the making of the album that signaled the descent of Sylvester Sly Stone Stewart into a haze of drug addiction and delirium is captivating enough for the cinema. In the spacious attic of a Beverly Hills mansion belonging to John and Michelle Phillips (of the Mamas and the Papas) during the fall of 1970, Sly Stone began recording his follow-up to 1969’s “Stand!” the most popular album of his band’s career.