@JoshB it's interesting you mentioned pop-music. In the former eastern block, there was a (quite large) underground movement that wanted to listen to their 60ies pop-idol and wear denim, all behind the iron curtain.
This obviously made them happier, otherwise they wouldn't search for it, and then I wonder; did the social enviornments play a role in making them feel more or less depressed, and if so; were they able to air their feelings on the topic? (my (highly personal / subjective) theory on that would be... no.)
What IS annoying me are those people who think it's "cool" to be what they think is "depressed", put massive amount of mascara around their eyes and confess themselves to be higher standing individuals...