A person diagnosed with PTSD can associate a memory or experience with a song they have heard. This can result in either good or bad experiences. If it is a bad experience, the song's rhythm or lyrics can bring out the person's anxiety or fear response. If it is a good experience, the song can bring feelings of happiness or peace which could bring back positive emotions. Either way, music can be used as a tool to bring emotions forward and help the person cope with them.