Since then, the average reading level of pop music has been plummeting. The study places it now between grade levels 2.5 and 3. But it isn't just the lyrics — the music itself is getting worse too.

Griffith plotted a person’s average SAT/ACT score with their 10 most frequent favorite music choices on Facebook and came up with the above graph (click to enlarge) that compares the two.

This scatter graph will help you get a grip on pretty much any genre of music, including some you’ve likely never heard of. According to its creator, Glenn McDonald, the graph is ever-evolving: ...