I don't know if it's the same file, but here's a link for a mp3 of the Ca Ira ouverture recently performed.
This is the link to the web page, the file is under the "MEGA NEWS!!!" thing, just click on "Download".

http://www.pink-floyd.it/news/home.htm

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"Don't you know there ain't no devil, it's just god when he's drunk." Tom Waits