A boy and his father are banished because the father, a magician, has a habit of making things vanish. But when the monster Abiyoyo appears . . . the boy plays a song on his ukelele to make the monster dance; then the father makes Abiyoyo disappear, and all is forgiven. The charm of this . . . lies in Seeger's wry understatement coupled with Hays' outstanding illustrations . . . The song, with music, is included