Immersion of music
Right music tunes in sync with your brain waves. It scratches you inner itch in a right way and sends shivers through your spine.
It can also speak to you in a deeper level. Touch your feelings, or make you think. Sometimes the words are just right on their own. They might be just words, but written in such a way they become something more.
Some songs bring up memories. Good moments from the past when that particular piece has been playing in the background. Other times it just captures your mood perfectly.