Kelly, Yaz, Olivia, Eve and Charlotte are GirlFriendZ - the world's most popular band. But they live at a time when music is forbidden and sinister ('Music is Banned') agents hunt down singers and musicians and take them to 'harmony' camps, where they are mind-wiped. The girls go on the run, playing secret concerts and using music as a weapon to fight back. Staying one step ahead of MIB is no easy task however. If GirlFriendZ fall into their evil clutches then it really will be the day the music died!