Music can be used therapeutically in a number of ways. Sometimes you may wish to listen to music you find calming to help you lift your mood. At other times it may be more helpful to listen to music that matches the mood you are in - music can express for us emotions that we find difficult to express ourselves.
Playing or creating music yourself can also be used therapeutically. Playing a drum can help us to express anger or frustation; songwriting may allow us to put words to the emotions we are feeling.
Sometimes it can be beneficial to communicate through music - for example, when I play music with someone else, or in a group, I can feel heard, express feelings in a way that might feel easier or safer than through words, and have the experience of this being supported and received by others.
If you are interested in deepening your experience of using music to help you therapeutically, you might consider working with a music therapist. Music therapists complete rigorous training through post-graduate study, and are skilled in assisting people to use music in a way that assists healing and recovery. For more information you may like to check out the Australian Music Therapy Association website at http://www.austmta.org.au