Released in 1974, David Bowie's "Diamond Dogs" moved Bowie away from his Ziggy Stardust persona and towards what would be his "plastic soul" period. As it is a midway point between the two, "Diamond Dogs" is a combination of glam rock and soul, with dark, bleak overtones. The album was originally meant to be from Bowie's ill-fated musical based on George Orwell's "1984", and therefore the feel is very grim and dystopian.
I'm a huge Bowie fan, but my favorite album by far is "Diamond Dogs". The intro track, "Future Legend" is incredible, and it's not really even a song. It sets the mood for the album excellently. The other songs on the album all work well together, creating a very melancholic feeling.
Overall, "Diamond Dogs" is the perfect album experience. It deserves to be listened to as a complete work, from the first song to the last, and not as a collection of random songs like many of today's albums.