WG is a music aid designed to learn the staff and the scales for 2-4 year olds. Through music teaching books, children can learn to use different wooden discs to create music. They can insert wooden sticks of different forest animals into the seven-diameter holes on the wooden disc, and turn the gears to turn the wooden disc and hit the shrapnel of the music box below to make a sound. The WG allows children to assemble and experience gear structures and allows children to freely create forest animal scenes. The WG is a storage box, allowing children to store and learn after each study and play