strange GDW wail

[nailatixela]

I was listening to a really cool version of GDW from the Rumours tour from their first night in MSG. Back then Stevie often did the wails at the end of the song as well that sounded similar to the wails that end the studio version. However, with this one I was shocked at the sound I heard. First I thought it must have come from a guitar or something strange. It was very high pitched. But then as this noise got deep and I realized it was clearly Stevie's voice.

http://www.mediafire.com/?dsujj80intj8l1g

That's an itunes file. The noise starts at about 6:40. I've never heard her go this high! It's pretty creepy. So I wanted to share and see what everybody else thought.