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MIxed in these themes:

1. Galaga's Starting Theme
2. Galaga's Challenging Stage (when you get a perfect score)
3. Galaga's Enter your initials
4. Galaga's Enter your initials (when you get the number one high score)

What if the original Galaga had an ending theme?
(Speaking of which, I'm going to go NOT play some emulated Galaga '88/'90 right now.) ;)