The unlikely story of the Gennett Recording Studios, where many of the greatest artists in American jazz, blues, country, and gospel music first recorded. The documentary traces the careers of early Gennett musicians, including Louis Armstrong, Bix Beiderbecke, Hoagy Carmichael, Duke Ellington, and the singing cowboy Gene Autry, among other popular artists of the era, and features several of their rare 1920s recordings.