Every year thousands compete in the world's greatest singing competition... that you've never heard of. AMERICAN HARMONY journeys deep into the ultra-obsessive, zany and heartfelt world of competitive barbershop singing, where passion is only equaled by raw talent, and the reward is not fame or glory, but simply victory. The film focuses on four quartets vying to win the International Championship of Barbershop Singing, in what turns out to be the closest and most controversial victory in its 70 year history. MAX Q is the heavy favorite - a superstar quartet comprised of former champions. Looking to upset them is OC TIMES (The Heartthrobs), VOCAL SPECTRUM (The Rookies), and REVEILLE, an aging foursome with two members who have sung together for almost 30 years. In total 50 quartets battle it out for the coveted gold medal, while facing the pressures of quartet life - from giant egos to brain cancer and everything in between. To win, it's not enough to have one "Idol" - a quartet must have perfect harmony.