My son is 4. He's already been subjected to plenty of Phish in the car. A few months ago, I was playing the Radio City Ghost and turned it off as we got home. He said "Why'd you turn that off?". He has never said that about any other Phish performance he has heard. A week or so ago, I listened to the 11/17/97 Ghost a few times in the car and he did not object when I turned it off. Is he devolving?

As per the Ghost song history on Phish.net:

In The Phish Book Trey referred to the 11/17/97 Denver “Ghost” as his favorite part of his favorite show from the fall tour, a show the band listened to many times, in a way influencing themselves.