In retrospect, it's obvious that Epic Mickey 2: The Power of Two would be a musical. It's the natural path toward making the Disneyest thing possible, and that's where Junction Point creative director Warren Spector's interests lie. Before I played a demo, I and other press were presented with a cutscene setting up the story.
The Mad Doctor makes a dramatic return to Os Town, amidst rumbling earthquakes (thanks for physically making my seat rumble in the theater, Disney), claiming to be reformed and seeking a hero to help him save the people from some unknown calamity.
And all this claiming and seeking is done in song. "Help ME, help YOU!" he sing-talks in heavily accented English. It works to convince Oswald to join him, and it worked to convince me that Warren Spector is all about the principles of Disney. I guess I didn't need much convincing there anyway.