Usually by falling into the sort of feel of the music they listen to. If it's a sad song, they begin to feel down. If its happy and upbeat, they may feel more happy and energetic.
I listen 2 it all the time. When I'm Mad or Sad or even bored or in a great mood. Music is just great no matter what kind..
We think it is cool and it helps me personally through the day I listen to music at least an hour a day