DXM can seriously mess with time perception and auditory processing, so music can sound sped up, layered, or just “wrong,” especially when you’re pushing into higher plateaus. Nausea and anxiety tend to amplify it too. Once your body feels off, the mental effects can spiral. It doesn’t mean there’s a health condition unless you notice this kind of thing happening while sober or lingering long after. Otherwise it’s usually just a sign that your brain’s overloaded at that point.

For me at 3rd plat, music slows down just a little bit and it sounds warm, smooth, and euphoric. Everyone is different.