Wasn’t he also a paranoid schizophrenic? Depending on how it manifests, that shit can change your entire personality.

I haven’t gotten to the depths yet, but some responses seem earnest. Different degrees of proof needed when confirmation bias is in play.

I’d say that most forms of music have some kind of rhythm instrument, often those are some form of percussion instrument.

I’ve definitely heard some experimental stuff that didn’t use any form of rhythm instruments. Then again, you can just record the ambient sound of a city and call that music, so to each their own.