I don't know what it is. I can't quite explain it. Every time I listen to PMT though I feel it. The songs are like a vaccum, they move through you and fill you with a void. It's the only album in my collection that presents a sort of hollow apathy towards the world as if it sees everything in some sort of half-sleep state where you'd only partially understand the world as you normally would.
I think this is Tricky's most important album, and the only reason I gave it 4 stars instead of 5 is simply because you can't listen to it whenever you want to. The music is very abstract, and the voices and lyrics are usually garbled or spoken in a seemingly disjointed manner that doesn't really follow any clear method. Thoughts and analysis ruin the album, and you have to listen to the voices and not the words being spoken. If you listen to it around lunch-time when you're wide-eyed awake and dilligently pursuing some errand in your day, you'll be thinking and moving too fast to get this. The moon and stars have to be around when you hear this, and even then you have to be in a certain state of mind; you basically have to be in a mental place where you don't particularly care about anything. Then, this album comes alive and engulfs your brain like cold black tar. It flows over you and through you, like some faceless phantom.
It's hard to explain, this is a truly unique album. Despite how many times you listen to it or try to get into it, you'll never appreciate it until you hear it under the right circumstances.