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Modulating to the 5th is common in classical and classica-derived music such as Trance, but mostly what you're probably hearing isn't even a modulation, it's just a I-V progression, and the producer couldn't be bothered to write another bassline so he just transposed the original one (I'd argue that a bassline of 8 C's followed by 8 E's is hella boring to begin with).
Anyway, we already answered your question about key. I don't think you're going to fully understand until you learn about chords and progressions. I'm not trying to be condescending, it's just that I've heard a lot of these types of questions before and they're always the result of piecemeal knowledge about music theory - a subject which is very ill-suited to the "just-in-time" learning that tends to work fine for most computer apps.
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