I studied voice as my minor in University and this was one of my favorite songs that I ever performed. I forgot about it and then heard it in this commercial a month ago and have been going crazy ever since trying to find it. I finally heard it again and remembered enough to email my old opera prof. and he told me the title. I saw your post the other day when I was searching for it so I thought that I would pass along the knowledge. It is an AMAZING song...I want to have in sung at my wedding next summer!
'Lascia ch'io pianga mia cruda sorte...' from
Handel's, Rinaldo.
Enjoy