Music has the ability to evoke strong feelings when we listen to it, especially if a certain song is tied to specific events in our past. If we are having a particularly stressful day, listening to relaxing music or certain songs that bring to mind happy memories can help us let that stress go. In some cases, it can help us forget trying life situations we might be living through such as rejection letters, health problems of family members or ourselves, uncertain economic situations, etc.
The growing field of music therapy has been used in numerous types of medical situations, and additional benefits have been boosting immunity, staving off depression, and easing muscle tension.
An interesting article on how music promotes good health can be found here.
Here, for your relaxing pleasure, is "Watermark" by Enya.