The UI file necessary for this application is already created for you. The purpose of this section is not to show you how to generate the UI from scratch. It will just illustrate some of the important aspects of developing GUI using QT Designer for this application. You can then experiment with it further to add new widgets to the music player application. We used QT Designer while developing the 'Thumbnail Maker' application in Chapter 2, Working with Images. We will cover some of those things here as well.
Ui_AudioPlayerDialog.uifrom the Packt website.