Pink Floyd - The Great Gig in the Sky Lyrics Meaning

Okay, just mentioning this to clear this ALL up, as most people seem to have random inaccuracies in what they say:

-The vocal solo is done by Claire Torry.
-She DID sue them for a large amount of money, in about 2004, and won, having her name listed in the credit of the PULSE dvd.
-She was absolutely NOT told to sing like she was having an orgasm. She was told to think about some depressing stuff, and told explicitly not to form words.
-She did the recording in four takes.
-She was not happy with it, despite the band thinking it was magnificent.
-The person who talks at the beginning Is in fact, a doorman.
-The second person to speak in the song (the woman) is in fact, Naomi Watts' mother, Myfanwy Watts.
-Several times, Pink Floyd have denied the idea that the album Dark Side of the Moon is made to play along with The Wizard of Oz, stating that it is simply coincidence.
-It is a great song.