Jophiel wrote:
A healthy emotional state involves acknowledging sadness as well as joy. Being a black-garbed sad clown in your basement isn't healthy but neither is being a blindly pure-hearted Pollyanna.
Yes, we listen to sad songs because being emotionally healthy is a balancing act. It's not healthy to be depressed and sad all the time, it is also unhealthy to be exctatic about everything. At either extreme you're wasting energy, depression makes you lethargic and inactive, being overly happy leaves you chaotic and frantic.
Sad songs just let us even ourselves out.