Top-merry-go-round «Roundelay» is a music toy for babies. The baby can start the top by itself and wach animals in dressy costumes rotate around their axes to a merry folk melody. Even when the top comes to a complete stop the animals go on rotating. Babies are interested in studying bright animals, colorful flowers and a meadow with a birch. Starting the top babies study casual relations and realise that they can influence the speed of rotation. The coloring of the toy coinside with the specifics of babies' perception.