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Synthesia has already been mentioned but ill second it for learning piano. If you want a more Guitar Hero vibe there is Clone Hero. I havent tried it but its open source and has options for multiple instruments. Can’t really get closer to Guitar Hero from what ive seen.
Maybe im just a slob, but as long as it doesn’t feel greasy I really don’t mind the baked on grease. I still wash it. While it’s still hot ill fill it with soap water then scrub it out with a bottle brush. Im not stressing over the stains though.