Got play and pause functionality working
I honestly don't know what I did...
Got 'Browse' window to open, and add files to playlist.
Added functionality for next and prev buttons, but for some reason my playlist is still only one file.
Took out hard path so no more changing

We have to select our songs now before we play
Fixed playlist issues, now the only thing not working is the volume control.
Added label that shows current playing filename. Currently only updates when 'next' button is clicked.
Got volume slider to do its job.
Starting changing all variables to pointers.
Moved all functions to .cpp file.
Moved button-setup code into its own function.
Added an underscore to all variables EXCEPT 'ui'
Fixed issue with mainWindowIcon and successfully put an underscore in front of 'ui' variable.
Fixed issue with _filename display placement.
Added a functioning progress bar and cleaned up _filename initialization code.
Got rid of that stupid toolbar that for some reason nobody had noticed yet, and tweaked the progress bar's positioning a bit.
Changed _filename variable to _fileMetadata, and made label print data in the following format: %Album Artist% - %Song Title%.
Changed _fileMetadata so that what it displays depends on available metadata.
Cleaned up the code a bit.
Finally managed to change QPushButton objects into QPushButton *