Thanks to hexthat for the update!
To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).
To use in CPython, `pip install adafruit-circuitpython-rtttl`.
Read the [docs](http://circuitpython.readthedocs.io/projects/rtttl/en/latest/) for info on how to use it.