The voice/sound output started to sound as if the people's voices were given helium, music sped up as well?

Sound is a wave. Pitch is the frequency of the sound wave. Frequency is the speed at which a wave repeats.

(Not to be confused with the speed at which the wave moves across space) So if you play a recorded sound in half as much time, you double its frequency.

It's simple. When the disk is turning faster, the sound waves imprinted on it are going faster around the pivot. And faster means more cycles, more wavelengths, in the same time interval.

So we have more cycles/second which is a higher frequency.

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.