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A study from the University of Pittsburgh School of Medicine shows that teenagers who listen to more music than other teens are more likely to experience major depression.  The study had 106 participants, 46 of which had major depressive disorder.

The top quarter of teens who listened to the most music were 8.3 times more likely to be depressed than the teens who feel into the lower quadrant of music listening.  Interestingly, though researchers expected to see a similar result, television watching did not have the same connection to depression.

Here is the reading part:

The top quarter of teens in the study who read the most, including not only books but magazines and newspapers, were one-tenth as likely to be depressed as those in the lower quadrant who read the least. 

The question is whether music or depression came first and also whether reading or not being depressed came first.