On July 8, 113 costumed singers belted out the melody to Dolly Parton’s “9 to 5” in a choreographed, frenetic performance that ultimately won gold at the International Barbershop Harmony Society Convention — the fifth championship for the St. Charles-based Ambassadors of Harmony barbershop chorus. The chorus’ co-directors, Jim Henry and Jonny Moroni, recount how they planned and pulled together for the competition, and the enduring popularity of barbershop chorus.