The schematic [here](https://github.com/arduino/docs-content/blob/main/content/built-in-examples/02.digital/tonePitchFollower/tonePitchFollower.md) ([as published](https://docs.arduino.cc/built-in-examples/digital/tonePitchFollower)) is not correct. The description and source code all indicate the speaker is connected to pin 9. The breadboard diagram is incorrect. The blue wire from pin 9 does not reach the resistor.