This is my favorite disk of the Wall in terms of story and music. Here, we see, er, hear the emotional distress and downward spiral of the character Pink, not to mention the songs themselves are great on a purely musical level. How can you go wrong with "Comfortably Numb", "Waiting for the Worms", and "The Trial"?
Few albums are as collectively good as this one. The artistic style is expanded outside of individual songs and into the album as a whole. Plus, having (in this humble listeners opinion) one of the greatest rock solos of all time (Comfortably Numb) helps too.