it was one of the masters for the production of 'Dark Side of the Moon', Alan Parsons (Alan Parsons Project) to bring in Clare Torrey for the "Great Gig in the Sky' as a vocalist.
Music is a language in itself , and to switch time signatures in the course of a song or even play a whole song and have it become a hit, i.e the song, "Money" by Pink Floyd is not an easy thing to do.
It's interesting that the song, "Us and Them" was written three years prior to 'Dark Side of the Moon' and submitted for the movie Zabriskie Point (1970) as part of the soundtrack.
In a round about way the song "Money" was influenced by Booker T and The MG's, maybe you can hear some of that influence from the song, "Green Onions" (I'll have the video for you below).
The inside poster came from the designer who actually went to Egypt to shoot the pyramids with infra-red technology. More of the 40 astonishing facts to come in weekly.