The Unplugged was indeed Squeeze. Nice catch, Mark.
Smokey's two hits were ABC's "When Smokey Sings" and Tom Tom Club's "Genius of Love" - I never paid close enough attention to the lyrics to notice. As for Marvin, yup, we're up to 3 '80s hits (would be 4 if Diana Ross's "Missing You" had mentioned him by name).
And shocker - the CMA answer isn't Garth Brooks! That had been my guess too.