I hope the World of Color stays around for decades and becomes a classic institution like the Main Street Electrical Parade and Fantasmic! have become at Disneyland, but I fear that they might overlook the best song for the attraction due to the fact that it came out in 1977 and has been largely forgotten since then.
I know Pete's Dragon is pre-Disney Renaissance and I'm sure it's as unfamiliar to kids today as Tom Sawyer, but there is a song in it called "Candle on the Water" which is filled with a very emotional and heart-wrenching quality with its lyrics of hope and faith. I grew up with Pete's Dragon and it is still one of my favorite movies of all time. That song always bored me as a kid and I always fast-forwarded it, but over the decades it's really brought a whole other spin on the movie seeing it from an adult's perspective. It's basically about hope where there is no hope and trusting that even when things look bleak, you can always rely on faith to pull you through.
Anyway, it's very slow and it'd be perfect to break up the undoubtly fast-paced and vibrant scenes that will no doubt fill the beginning and ending. It would be the "Princess Barge" section of the show in other words. If they set that song to 200-foot high fountains and colored water, I would pay full admission to DCA just to see that one scene!
My gosh Disney, PLEASE do not overlook that relatively dark period in-between the Walt era and the Disney Renaissance era. I'm sure they can leave "The Black Hole" and "Tron" back in that era, but "Candle on the Water" is such a hidden gem that has been *severely* overlooked since it came out, especially with something as perfect as a water show!