One of life's mysteries solved....maybe

For so many years I had wondered about something. When people are happy, they listen to happy songs, naturally. But why? The answer is not as obvious as you would think because when people are sad, they listen to sad songs as well. I would describe it as swimming in misery.
I think it has to do with exploration and being unable to turn back once the course has been set. We have to explore where we are and who we are as we reach rock bottom. And once we have and get tired of our current state, we'll begin to head in a new direction.