A little general help to make a music player

[MegasXLR]

OK, so I installed Python 3.5.4

why not 3.6.5?

Because PySide doesn't work on 3.6.5 as mentioned by @ThiefOfTime.

[Larz60+]

bad PySide! OK, I get it

[MegasXLR]

I managed to make the GUI part I guess. But now when I use "pyuic4.exe GUI.ui > GUI.py" it makes the Python file, which is great. I have a stupid question though, how to actually run this GUI.py file so that it displays the window? I tried a few Qt app templates (skeletons?) but none worked, always gave errors. This is how it looks: https://i.imgur.com/hIis6da.png
The three squares in the middle should be buttons made up of my own PNG images (if that's even possible), the left big white space is a list view and should be a playlist and the right one is a text browser and should display the lyrics if the song has any in it. "Open File" opens a dialog box from which I can select a file to play (currently I only know how to play MP3, need M3U/PLS later on).

:s please help