Jonathan's Musical Mice: A Spot the differences book is the first of a series of books including mice and other animals. All these characters are cartoons drawn by the author. This Spot the differences book includes twenty-four illustrations, arranged two at a time. Each pair of pictures has five or six differences. The changes may be in the form of items added or removed. Solutions are included at the end of the book. Jonathan's Musical Mice might seem like a parody of other "Spot the differences" books of its kind but children, especially those between 3 and 8 years old, may enjoy it.