Mr. Mason is a bird that takes over the job of teaching music at Adam West High School when the previous teacher quits in "Connie's Celica".
When the family hears Chris playing only a single note over and over on the recorder, he attributes it to Mr. Mason's teaching. As a result, Lois offers her services as teacher, having taught piano in the past.
Mr. Mason is fired and returns to his nest where Mrs. Mason is disappointed, having looked forward to settling down and having children.