goes to disney. is upset when hears disney music
This is where people miss the point. First, Epcot Music is Disney music.
Second, it's about usage and fit. If you came down the hill in Pirates and they suddenly started singing Fathoms Below, it would be confusing and make no sense.
Being Disney doesn't make it good. Having good, cohesive story telling and messaging is what makes it Disney (or at least it used to).