This book was inspired by the medley “Somewhere Over the Rainbow / What a Wonderful World” created by Israel “IZ” Kamakawiwo’ole. When a baby boy is born, his grandpa tells him to listen because the world is a lullaby. All through the story the boy is trying to listen for the song until one day he finally hears it and plays his ‘ukulele and sings about dreams and rainbows. Penelope Dullaghan’s vibrant illustrations reflect the feelings on each page. There is a note about IZ and the inspiration for this story as well as the words to the song at the end of the book.