It's possible there are a couple of reasons for the confusion:
* Typo or Misremembered Title: Maybe you are thinking of a different book by Gary Soto, and the title is slightly different.
* A Different Author: Perhaps you are thinking of a book by a different author altogether.
To help me understand your request better, could you please:
1. Double-check the title of the book: Is it definitely "Jazzonia" or something similar?
2. Tell me the author's name: Is it definitely Gary Soto, or a different author?
3. Describe the story: What's the book about? This will help me narrow down the possibilities.
Once I have this information, I can explain the importance of setting in the book you are asking about.