Lilly Lamm loves lullabies! All kinds of lullabies: happy ones, sad ones, short ones and long ones, tall ones, thin ones, fat ones and small ones! And every night Lilly insists someone sing her a lullaby. But when her mother and father, brothers and sisters, and cousins and aunts and uncles, and grandpa and grandma can't sing enough lullabies to keep Lilly satisfied, she has to make up her own. But can Lilly learn to time a rhyme and lilt a lullaby when she doesn't yet know how to write?