Music is one of the few things that has remained constant through the centuries this world has existed. Not only does music provide entertainment, it also has several effects linked to it. Music allows emotions of happiness and sadness to arise. From those emotions, physical effects, negative or positive, can occur. Music has a profound effect on the emotional, social, intellectual, and physical aspects of a person. Emotions are easily affected by outside forces. Music can provoke emotions of sadness, grief, joy, and even ecstasy. There are several different aspects of music that change how a song is interpreted. From these interpretations come emotions. Among them is the tempo, which is the speed of the song. If a song is sad, the tempo is often slower. If a song is meant to be happy, the tempo is quick and light. If the intention of a song is to bring about fear, it is either extremely slow and eerie or quick and adrenaline pumping. Another factor of interpretation is the key it is in. A key is, “a particular scale or system of tones” (Dictionary.com). There are 24 different keys that are separated into two categories. These categories are major and minor. The major are made up of more sharps, and the minor of more flats. The major key is used to express feelings of joy and happiness. The minor key however, is used to express feelings of sadness, depression, and regret. When the two are awkwardly combined, the key of the music changes to neither minor or major, and is referred to as a dissonance. A dissonance is defined as, “a simultaneous combination of tones conventionally accepted as being in a state of unrest and needing completion” (Dictionary.com). When a passage of music uses a dissonance, the ultimate goal is to create ... ... middle of paper ... ...www.cerebromente.org.br/n15/mente/musica.html>. Savill, Agnes. "Music and Letters." Physical Effects of Music. N.p., n.d. Web. 14 Jan 2012. . UCP, . "Benefits of Music for Children with Special Needs: Tips for Parents and Educators." United Cerebral Palsy. N.p., 2012. Web. 12 Jan 2012. Vaidya, Geetanjali. "Music, Emotion and the Brain." Serendip. N.p., 2004. Web. 7 Jan 2012. . Weir, Kirsten, and Debbie Nevins. "Music And Your Mind.. (Cover Story)." Current Health Kids 34.1 (2010): 10-12. Health Source - Consumer Edition. Web. 9 Jan. 2012. Wicke, Roger W. . "Rocky Mountain Herbal Institute." Effects of music and sound on human health . N.p., 2002. Web. 14 Jan 2012.