A chap named Virgil Griffith has correlated the most popular books at every college in the US (as fetched from Facebook) with that school's average test score to find
a correlation between intelligence and favourite books. According to Griffith's study, the book most correlated with high scores is Vladimir Nabokov's
Lolita, and that with low scores is the Holy Bible (not to be confused with the Bible, which is around the middle, just below Harry Potter); other books correlated with high scores are Ayn Rand's
Atlas Shrugged, Kurt Vonnegut's
Cat's Cradle, and
Freakonomics, and books dumber than "I Dont Read" include various erotica and hip-hop/ghetto fiction,
The Purpose Driven Life and
Fahrenheit 451. Slightly smarter than not reading are the likes of
Fight Club, Dan Brown and John Grisham, along with Shakespeare's
Hamlet; sci-fi, fantasy and geek/fan-interest books like
The Lord of the Rings,
Dune and, umm,
Eragon rate more highly. (Mind you, this is correlated to test scores, not cultural well-roundedness.)
It would be interesting to see one of these correlating a measure of intelligence (such as test scores) with other factors, such as favourite music (I imagine things that a lot of geeks listen to, like metal, industrial and prog rock would come out on top, and rap-metal/nu-metal and R&B would come out fairly low), movies, or even which Facebook groups/applications one has installed.
Looks godawfully dodgy. The causaton issues are quite apparent with Freakonomics, Ayn Rand and the Alchemist coming so high up. Those books are popular among the business school set and almost nobody else, so they are going to register a much larger effect. Fahrenheit 451 and The Colour Purple got a low score because they were required reading in high school, and those were probably the only books the underperforming ones read.
I suspect these correlations will disappear once you correct for majors and socioeconomic status, and the same goes for music.