I have used this book for many years to teach the concept of 4 voices in music. These posters were created with the idea in mind that students would classify the parts of the stories into the four separate voice uses... speaking, singing, whispering or yelling.
Mortimer BE QUIET! - yelling
Yes - whispering
Thump thump thump etc - singing
Clang Clang -singing
Narrator - speaking