Health and safety manager Debra hopes that she will not have people running for the exits, primary school teacher James would love to teach his class and his own children that anything is possible and train up his terrible singing voice, 18-year-old Phoebe wants to avoid being laughed at during karaoke, hairdresser Karen drives her clients mad, and fitness coach Pedram wants to lose his accent and improve his vocals. Can any of them change their tune?