Music
Every country and every culture has its own form of music that is attributed to the way in which that culture is assembled. Since the dawn of man music has played a large role in society in some way or another. It goes to show how long lasting and versatile the art form really is. It is also important in many different ways – it can be a form of entertainment (in the form of pop music, radio airplay, clubs, live shows, CDs and mp3 players), for religious ceremony (hymns in church or Christian rock), or it can be a form of expression or protest (songs by Rage Against the Machine or Neil Young for example).
Music is such a large part of culture that it can never be removed. New genres can come and go and current ones can increase in popularity, but there will also be music in some form. Without this great form of entertainment, every other walk of life would suffer in some way. Workers will have to work in silence, films would lose a large way of expressing ideas and the world would sound a lot less vibrant.