And it doesn't have to be country songs. EDIT: Thomas has the right answer. The key word is "variety"...which might include both the good and the bad!
We all know what the good means, it's events in life that bring joy and happiness to you. The bad might include experiencing love (and then getting dumped once or twice), losing your job, losing your father or mother, becoming deadly sick or getting into an accident and ending up in the hospital. The list is endless.
Variety means a spectrum of experiences, from the really good to the good to the bad and to the really bad. Bad events can inspire a song just as good events can.
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.