Support for Python 3.x

[SpiritSeal]

Trying to run the program with Python 3.x (as opposed to 2.x, on which it is built) creates the following error
Traceback (most recent call last): File "main.py", line 20, in <module> from Tkinter import * ModuleNotFoundError: No module named 'Tkinter' PS C:\Users\******\Documents\FourVoices\FourVoices\src>