In the early version of the album, which was entitled "Eclipse: A Piece For Assorted Lunatics" and was performed several times live in 1972, some of the songs were actually different. The Great Gig In The Sky was The Mortality Sequence and was a totally different piece of music. On The Run as we know it didn't exist and in that place there was this piece called Travelling Section, which basically was an instrumental jam.
It's very interesting to listen to these early live performances and you can easily find many ROIOs documenting those concerts.

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