Music is a common feature of every culture and it has been composed to accommodate any kind of mood, from the depths of despair to complete happiness. Like many art forms, music mirrors society, sometimes raising questions about norms and values, and sometimes even causing change. Popular music has been known to create an identity for groups of people. Songs that were popular during World War II helped unify soldiers with those at home. Songs and music sometimes become symbols for a particular group of people, a place or a historical event. Some music is even considered a symbol for a whole generation. Music exists in many forms and means different things to different people.