From my knowledge, Graceworld was and still is the most recent "eternal world" of the Lord.
As I stated in other posts, rock and roll has a tendency to reach into our subconscious far deeper than we expect. Since the conditions of Graceworld provoked many unpleasant past life memories, it was determined that this planet would be the home of mental therapies that got rid of these memories.
Does any of the above ring a bell with you?
If we were all good superbeings like Harry Potter or Spiderman, things might have worked out differently.
Take a look at Meatloaf's cosmic view of "Rock And Roll."
Rock And Roll Dreams