This head-and-shoulders portrait shows a boy holding a flute in his right hand. His head is inclined slightly to the side, and he seems to be listening to the sound of his music—the raised left hand reinforces this intention. The spontaneous, flatly applied brushline is typical of Hals, who frequently painted cheerful children, often making music. The picture type, the handling of light and the boy's theatrical costume clearly show the influence of Caravaggio's followers in Utrecht.