What's a piece of good music?

As I was listening to this (Coldplay's Postcards From Far Away), it suddenly came to me the thought that good music is like playing the tune you've already known, telling you a sweet story you've heard before, an old friend reunited, but somehow it's just buried under your consciousness. Now it's awaken once again. It surfaces from the sea of the forgotten. That's why it's so soothing and a joy to our heart. It was lost. Now found.