Personally when I think of Cyberpunk I think of Jet Set Radio/Bomb Rush Cyberfunk, or I think of something along the lines of Akira or the music video for Ken Ishii - Extra. That said, the pop-culture aesthetic is mostly based on Bladerunner, which was based on what people thought a dystopian future would look like in the 80’s. What would future-80’s music sound like? Well, that was when synths really started taking off, so future music is obviously all synth-based because why would you need another instrument if your keyboard can do it all?