The Cranky Caterpillar | Richard Graham

One day Ezra hears a gloomy blue tune coming from the piano. To her surprise, it's a caterpillar making the sound: a cranky caterpillar. Ezra tries to cheer him up with some fresh air, cakes, and new hats, but nothing seems to work..What can Ezra do to help the cranky caterpillar change his tune?