A classic
If I were to be allowed five albums for the rest of my life, this would be at the top of the list. Just had to replace a missing album, and actually, as cheap as this was I think I'll keep buying CDs from Amazon. This one can never leave my collection, and if it does I'll have a replacement faster than you can say Pink Floyd.

Pink Floyd - "Dark Side of the Moon"
There's a reason this album seems to consistently win "Best Rock Album of All Time" on many reviews I've seen. Besides the classics you've probably heard so many times, like "Time", "Money", and "Us and Them", there are long, very dreamy, instrumental passages, and many sound effects, such as those you hear at the beginning of "Money" and "Time". It is an album with an almost hypnotic quality. It is definitely one not to be missed by any rock fan.

Pink Floyd is the Pink Floyd of Classic Rock.
There is a reason that any modern band with progressive, space rock elements is referred to as the "Pink Floyd" of its respective genre. Pink Floyd is a very important figure in rock history, and anyone who claims to be a fan of music should hear this album at least once.

Fantastic music
I have always loved this album... I was sitting in a coffee shop with one headphone in and one out. And the part on 'the dark side of the moon' when the luner laughs, LOL, I actually turned around to see if someone had laughed behind me... It was hilarious, I giggle about that every time I hear that song...

Overrated but still awesome
I think Meddle is a better album, but this is the album that everyone will remember Pink Floyd by. And it's better than most bands will ever put out so it's hard to fault it. Anyone who likes rock probably ought to add this to their collection. There is a reason why this is one of the top selling albums of ALL TIME. It is a monument of rock - almost anything Floyd was ever involved with was.