Can you be more specific? Just alternate between G and C? Is that it?
How fast?
Quarter note, half note?
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Viridian Forest (Pokemon R/B/Y)
Scene 1 (Teenage Mutant Ninja Turtles 3: Manhattan Project)
Rocket Hideout (Pokemon R/B/Y)
And here's some links with connected concepts:
Magic PowersAnd here's something different: