I think your project contains errors. I found this by testing your application: First of all you use two buttons on the right side of the page, one red and one blue, that we can't understand what they are for. Secondly you don't have a button to open files. Also we can't drag and drop a file to be played in your application. And if we manage to play a file we can't see the title of it nowhere on screen. In addition the line you use on the bottom of the screen doesn't seem to work. I think the line should show us how the song progresses. Also we should have the ability through this line to move the song at which time we want to listen. Furthermore we can't create a playlist but only one song can be played at the time.