Well, you need to understand copyright. The song your brother was singing was most likely copyrighted. That means that only the owners of the songs are allowed to use it, legally.
If you have permission from them, then yes, you can use it.
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.