What is the connection between Pink Floyds album The Dark Side Of The Moon and the 1939 classic film The Wizard Of Oz?

Well, the first article to tie the two works together was a piece called "The Dark Side Of The Rainbow," written in August 1995 by Charles Savage of The Fort Wayne Journal Gazette. He noted that starting the Pink Floyd album during the first roar (or third roar, as is more common) from the MGM lion at the beginning of The Wizard of Oz produces eerie "synchronicities," like the following:

Around four minutes and ten seconds into the film, Dorothy falls into the big pen just as the song "Breathe (In The Air)" ends.

About thirteen minutes and fifty seconds in, David Gilmour sings "Home, home again" while the fortune teller describes Aunt Em needing help at the family farm.

Fourteen minutes and fifty seconds in, "The Great Gig in the Sky" begins just as the tornado begins.
Around nineteen minutes and thirty five seconds in, Dorothy opens the door to the house to find the colorful Munchkinland-the start of the second act of the movie-as "Money," the first song on the original LP's second side, begins. Thirty seven minutes and twenty seconds in, "Brain Damage" starts playing while the Scarecrow sings "If I Only Had a Brain." As he and Dorothy sit on the Yellow Brick Road, Roger Waters sings "Got to keep the loonies on the path."

Just as the album closes with a heartbeat, Dorothy knocks on and puts her ear to the Tin Woodsman's chest (around forty two and a half minutes in).

Around fifty two minutes and eleven seconds in, the group jumps with the beat during the second run of "Time."

That just scratches the surface. There have been dozens of other parallel moments noted over the years, and the theorizing even extends to the album artwork, which features light entering a prism and splitting into a rainbow, reminiscent of the film's transformation from black and white into color, as well as its keynote song, "Over The Rainbow."

It seems, though, that the parallels aren't on purpose. Pink Floyd themselves have denied any intended connection between the two works, citing the phenomenon as coincidence only. Guitarist/vocalist David Gilmour was quoted in an interview as saying "Some guy with too much time on his hands had this idea of combining Wizard of Oz with Dark Side of the Moon," and drummer Nick Mason said jokingly "It's absolute nonsense. It has nothing to do with The Wizard of Oz. It was all based on The Sound Of Music."

Even Charles Savage, who brought the phenomenon into the mainstream, said the theory merely came from an internet post...which cited "some people down in Los Angeles."