Music has evolved alongside humanity and plays an important role in life. It can be used in medicine to help relax the body and calm the mind, helping with conditions like autism and dementia. In the movie 127 Hours, the main character listens to rock and metal music which accelerates his heart rate and causes feelings of happiness, but when trapped, the music brings back good memories and emotions to help cope with his pain, desperation and anxiety. Music in Forrest Gump similarly evokes positive memories.