This acclaimed documentary charts the not-so-secret history of the Funk Brothers, an ensemble culled from the best of Detroit's jazz and blues scene by producer Berry Gordy in 1959 to back up the singers of his then-fledgling Motown label. Though largely forgotten in later years, theirs was a 14-year run of legendary songs unrivaled in the annals of popular music, creating more number-one hits than the Beatles, the Beach Boys, the Rolling Stones and Elvis Presley combined. A treasure trove of the era's best sounds.