As discussed in Initial Threads "An initial thread schedules the GUI creation task by invoking invokeLater or invokeAndWait ." You are trying to both play a sound and operate a GUI on the same initial thread. Instead, start the sound on the initial thread and construct the GUI on the EDT, as shown here or start a separate thread to play the sound, as shown here .
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.