The Black and White Future of New York City

Lately Ben and Dex have been playing instruments to each other.  Sometimes Dexter will play guitar while Ben reads Winnie the Pooh poems or a book and sometimes Ben will "write" a song for Dex.  The other night while they were trading off songs (I should say sounds) on the guitar, Dexter announced, "This next song is called, 'The Black and White Future of New York City'." Dex started playing the guitar and Ben's mouth hung open in wonderment - where does his brain come up with these things? Seems like pretty sophisticated conceptual stuff but then so does a lot of what little kids say.