Can you help me and find out who is singing?
 

Hi everyone, I hope you having a good day :)
I'm a newbie in this forum,
I have an audio file which has in it an incomplete opera singing,
But I don't know who is singing,
Can anyone help me to find out who is singing, or what's the name of this piece?
and thank you very much :)

Link to the file:
mediafire.com/?e002wrcdaqqwv2v

source: Einstein's Unfinished Symphony (BBC).