Final answer:
The speaker of the quote about mockingbirds in Harper Lee's novel is Maudie Atkinson, representing the idea of preserving innocence.
Step-by-step explanation:
The speaker of the quote "Your father's right," she said. "Mockingbirds don't do one thing but make music for us to sing their hearts out for us. That's why it's a sin to kill a mockingbird." is Maudie Atkinson. This line is from Harper Lee's novel To Kill a Mockingbird, where Miss Maudie provides insight into the metaphor of the mockingbird, representing innocence and goodness.