Music is highly cultural, and admissions is not solely merit based, so it's impossible to chalk this up to intelligence. Correlation to IQ would be much more interesting.
For example, URMs (primarily blacks, hispanics) are more likely to listen to hip hop than suburban white kids: URMs get an admissions boost so their averaged admitted SAT might be 200 points lower than the white kids. Not because they're dumber, but because the school wants more of them so they're less selective, letting most applicants in... then when surveyed of course their average SAT is gonna be lower.