This album is a work of genius, considering that it was conceived and produced when Sir Terry was only about one-third (as we speak) through his Discworld novels. Also, it was released some twenty years before Sky got their hands on the film rights, so all the character visualisation came straight out of Dave Greenslade's imagination.
What makes the music so special, though, is that Greenslade's imagination was completely in tune with everyone else's - which is a credit not only to his composition, but of course Sir Terry's ability to plant such vivid images in all of our minds. I dare say most Pratchett fans could listen to this album without referring to the tracklisting and be able to identify the characters and places portrayed.
To those who've read the comments about its technical quality, please consider this music was made using early 1990s technology and so perhaps its occasional imperfection reflects the music of its time... but then, doesn't that seem entirely appropriate for the Discworld?