If you had a talk show, who would you invite?

If you had a talk show, who would you invite to be a guest on it?

Any combination of regular guests, comedian(s) and/or musical guests.

Who do you think would make a good guest? Who do you think people would want to see? Who do you think has something to say that you think the world should hear? What book authors do you think wrote something that is important enough to discuss?
What group or singer would be a guest that you think presents the vibe you want the show to have?

Hypothetical, of course.