1. A reference to the side of the Earth's Moon that is constantly out of sight to the Earthlings of planet Terra, due to the fact that the speed of the Moon's turn is the same as the speed of the Moon's revolution, causing one side to always be facing its inside toward the Earth, and one side to always be facing outward toward outer Space.

It is in reference to the Moon as a Symbol of the mind, or Consciousness,

where the Dark side of the Moon references that outside the Light of the Mind, that which is a part of the
Collective Unconscious.

2. A Musical Album released in 1973 by the progressive rock group Pink Floyd, an album that instated a fantastic standard for musical groups everywhere.

The album has become a cultural sensation amongst a variety of genres, but especially represented in the psychedelic counter-culture.

The album has also been said to synchronize with the film The Wizard of Oz, when played at the correct moment, although the Band has rejected any intention of synchronizing the two.

The Synchronization of Dark Side of the Moon with The Wizard of Oz, has been called The Dark Side of Oz, and The Dark Side of the Rainbow.

An album by the legendary band Pink Floyd. Released in march 1973, it is considered, and is, one of the best albums of all time. It may not contain the greatest songs by the band, but the layout is amazing and the concept as well. If you want to have a great time, play the whole album on vinyl. Loud.
Here's the album layout :
Speak to Me : The intro to the album.
Breathe : Very relaxing song, with great lyrics. Wait. I'll stop here with the lyrics, since EVERY song in this album have great lyrics.
On the Run : Psychedelic sound made with synthesizers (or whatever you spell that word)
Time : Considered one of their best songs, Time starts with a fucking loud ringing noise, and then there's this amazing intro and then you have a great rock song.
The Great Gig in the Sky : Rick's Wright piano with a women singing, without any lyrics. Just singing and screaming. It's weird, but very beautiful.
Money : One of their classic songs. Also, a great sax solo and one of their best guitar solos.
Us and Them : Relaxing, mellow song.
Any Colour you Like : Again, psychedelic sound made with synthesizers, and with Gilmour's amazing guitar sound.
Brain Damage : This is the song that actually talks about the concept of the album. Great song.
Eclipse : One of the most amazing endings to an albums.

Dark Side of the Moon is one of those very few albums that you can hear again, again and again without getting bored of it.

Pink Floyd's opus, and basically put the band on the map. Released in 1973, and is still going strong in terms of sales and airplay.
It's musically transcendental, ethereal, cathartic; lyrically dark and even emotional, dealing with themes such as insecurity, insanity, war, death, and the evils of money.
Recommended for anyone who's just getting into rock music.

Dark Side of the Moon is when you don't know there is a "The" in the front of The Dark Side of the Moon and so you end up talking about Medicine Head's 1972 album "Dark Side of the Moon"

Famous Pink Floyd album released in 1973 that deals with issues of insecurity, insanity, death, and war. Small amounts of interviews done with various crew members are intertwined within it and is rumoured to correspond with The Wizard of Oz. 11th Best Selling Album in the world.

What one says when they're going to get high and listen to the Pink Floyd album The Dark Side of the Moon.

A drink composed of Jagermeister and Mexican coke. Can be deadly. Usually imbibed when drinker is feeling depressed.

Homage to the Pink Floyd album.

One of the most over used symbols of all time.

The CD that your children will listen to when they are poking smot.