Part of The Old Music Factory series:Toby the Drum and Gracie the Guitar decide to try and form a rock and roll band. Unfortunately Miss Broom (the only character in the books who isn't a musical instrument) decides to join the band as the singer but has a terrible voice. The story follows the exploits of the pair as they are made to take on the factory chores by the bossy broom while the rest of the instruments are outside playing in the snow.