Dame Ditty runs a successful school of singing (star pupil: Melody) much to the chagrin of the rival music teacher, Dr Discord (star pupils: none). When the Duke of Sterling arrives in town the rivalry between the two schools is brought into the open and a singing contest to be held at the local fair is suggested, but Dr Discord rigs the rules so only a male singer is eligible. Dame Ditty has no male singers - but then Tommy Tucker arrives and is asked to sing for her. Dirty work is afoot: Discord arranges with Mother Cursem to put a spell on Tommy, stealing his voice. But Melody and the Duke's daughter Sophie enlist the help of Professor Wizo to put matters right!