Music can define someone. Literally. Maybe not that person entirely but how they feel. If they are listening to sad music for a long time, they might be seen as a sad person. If you listen to happy, upbeat music, you might be seen as happy. Some people might just use music to get out their emotions. When someone is sad, they might listen to sad music. Or they might listen to happy music to change their mood. Sometimes, music can be more than just instruments and singing.