I have now spent a few months having a love affair with these pieces. The style of contrapuntal radio asks both more and less of a listener. It asks more in that you have to engage with the pieces as you would poetry or music. That is, the listener has to play a more active role in deciphering the voices and the overarching structure of the piece, rather than just listening to a linear, expositional account of a particular subject. What Gould goes so fantastically is to create a sense of dialogue from disparate voices and attitudes. In this way, the analogy with the a fugue does not go amiss.
It also asks a little less of the listener in that one can pay little attention to these voices (though they are compelling) and still come away with a tonal, impressionistic idea of landscape, peoples and places. This is partly achieved by the use of aural backgrounds which permeate each piece. In short, I have come back to these works in the way I come back to Bach or Beethoven (though of course B&B are more profound), learning more each time, coming to associate the voices as old friends.
For anyone looking for quite a unique experience- something that touches and stimulates the imagination, something soporific and enlivening then please try this.
As a last note, I downloaded this because the CD set is so expensive, though I would say that a project such as this would benefit from the higher quality that CDs usually afford over MP3s.