How to get Tone Library?

I need to use the Tone library for a project. Here's the link: https://code.google.com/archive/p/rogue-code/wikis/ToneLibraryDocumentation.wiki

I can't export it to GitHub because "The Google Code project export tool is no longer available".

How can I get the tone library, and if I do, would it be possible to play two or three notes out of pin 9 on my Arduino Uno?

What do you mean where to get the library? You linked to it in your post. Go to that page and download it. What am I missing here?

Download https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/rogue-code/Arduino-Library-Tone.zip

Unzip the downloaded file

Open the file Tone/Tone.cpp in a text editor

Change line 26 from:

#include <wiring.h>

to:

#include <Arduino.h>

Save the file

Copy the Tone folder to {sketchbook folder}/libraries. The location of {sketchbook folder} can be found in the Arduino IDE at File > Preferences > Sketchbook location.

Ian_Heine:
I can’t export it to GitHub because “The Google Code project export tool is no longer available”.

Why do you want to export it to GitHub?