The musical Centre on the “Jellicle folk”, a folk of cat who run into one time a twelvemonth at the Jellicle Ball, where they joy with their leader, Old Book of Deuteronomy. During the Jellicle Ball, merely one of the cat will be choose by Old Book of Deuteronomy to go to the Oliver Heaviside bed, be reborn and come up back to a different life, which is know as a “Jellicle Life”, merely before dawning.