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It is called "The Dark Side Of The Rainbow" to the factoid provoked when listening to the album The Dark Side of the Moon, released by Pink Floyd in 1973, and simultaneously contemplate the film the magician of Oz, released in the year 1939, so that some Scenes from the film seem to coincide with the music of that album.
The title comes from the combination of the names "Somewhere over the Rainbow" with the title of the album of Pink Floyd previously mentioned.