LauNChPaD: We've covered this earlier in this thread... and Driven is right (as usual).

It's Jon Carin on vocals at the end of 'Hey You'. I was there for the Yankee Stadium concert. It was Carin.

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"David Gilmour can do more with one note than most guitarists can do with the whole fretboard."

Dave Mustaine (Megadeth)