Here's an interesting chart the looks at what people listen to based on their college SAT scores. Basically, if you have a really high score than you probably listen to Beethoven, if it's moderately high it's Sufjan Stevens, Counting Crows, U2 and Radiohead. If it's on the low side, then you tend to listen more to hip hop, pop and rock. One of the more surprising parts of the chart is that jazz is pretty low on the "smart scale." We always think of the genre as more cerebral, but the chart doesn't bare that out.