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There is a guitar you can play without the use of an amp or the like. It's called an acoustic guitar lol. You could play an electric guitar without electricity too, but the difference is quite clear in the sound. Since it's an electric guitar you'd obviously need electricity. As for the cables, most guitars can go wireless now. It's the only other explanation. Not just for Ayu's band but for other bands I've seen live on DVD. They cannot possibly be playing a recording, although that was the case waaayyy back in the day.
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