The song is “Jai Ho†by AR Rahman|A R Rahman featuring Sukhvinder Singh, "Tanvi Shah" & "Mahalaxmi Iyer", so the 2 girls are probably the above-named ones from the film's audio track.
The original song had two female singers, Mahalakshmi Iyer and Tanvi Shah. So my best guess would be them.
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.