All Aerosmith but mostly Walk this Way, Dude (Looks Like a Lady), Sweet Emotion, and pretty much the whole "Pump" album. I guess because the first three tracks are played on the ride (Young , F.I.N.E, and Love in an Elevator) and the song "What it Takes" always plays outside the attraction pretty much every time I go to it.
But it's not so much just a certain song but also a genre of music that reminds me of Disney World. Classical music really reminds me of it for some reason (Especially the Fugue part of J.S. Bach's Toccata and Fugue. It reminds me of the classical music or renaissance era in the old Spaceship Earth haha) , so does Jazz and New Age music reminds me of Epcot.
I have a keyboard with a ton of effects on it and every once in a while I will find an effect that reminds me of Epcot and I'll play part of the Future World loop that I learned by ear :lol: