Inspired by the user's behavior of petting an animal, the sound adopts the shape of a bird to make the user want to subconsciously touch it. Users can switch songs by touching the head and tail of the bird. Touch the middle back of the bird once to complete the collection of music, and the back turned red is the music collection; Touch the back twice in a row for pause and start music. You can judge the music progress by the position of the bird, and determine whether the music is collected by the color of the bird's back. It is a sound that produces interactive emotions with users.