**Inspired by the beautiful true story of a nonverbal boy moved to speech at his first Mozart concert, this picture book is a testament to the power of art and the boundless joy it can bring.** When Grandfather comes to take his grandson to a concert, Ronan is quiet as they leave the house, quiet in the car, and quiet at the concert hall. But when the performance is over and the beautiful music fades out at last, Ronan opens his mouth…and lets out a great big WOW! Not any old WOW, but Ronan’s very first WOW! That one word fills up the hearts of Ronan’s family, the musicians, the audience, and—when the recording goes viral—the world.