Yo I really can't leave this conversation alone
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The last thing I want to say is, I feel like people are isolating this to one thing.
'Person listens to gangster rap and becomes gangster'.
That's not it. That's missing the entire magic that happens with sound. If you want verifiable proof of the influence of sound look into the research on brainwaves and how the mind can be entrained into those states through sound. Look into cymatics. Look into how every emotion and color has a corresponding frequency. Look into how water and cells are able to hold memory. Then ask yourself how you, in your body of mostly water, would somehow be immune to the influence of sound.
Again, I'm not saying it will make you murk something just by playing it, but there are definitely songs that come on and people will get aggressive real quick, songs that get everybody on the dance floor, songs that make people cry, feel spiritual etc.
TlDR: stop thinking about just rap and think about sound in general then look up the research that has already been done about sound and it's corresponding mental and emotional states