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You think music is a weaker socioeconomic correlate than books? I think it's trickier to name a stronger one. Music is entirely subjective and subject to peer pressure.

I would have expected music to be more weakly correlated with intelligence than books. Smart people can enjoy low-brow music as well as high-brow music. But smart people rarely read low-brow books, and dumb people rarely read high-brow literature.

However, I guess he wasn't looking at their whole collection but just the stuff they mentioned on facebook, which reflects their social aspirations. So, for example, I have both Lynyrd Skynyrd and Chopin in my iTunes collection. But people who mention one of those in their facebook profile are probably very different from those who mention the other.

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