How To Install pitches.h

How in the heck do I set up pitches.h?!?! >:( >:( >:(

In exactly the same way as you install any other library.
https://www.arduino.cc/en/guide/libraries

pitches.h is often part of a sketch, not a library. An example of this is the official "02.Digital > toneMelody" example sketch that comes with the Arduino IDE:

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