Music a global phenomenon. People around the world appreciates music even though they don't understand the lyrics (because of the language). Music is a universal language. It makes people unite. For example, the recent famous song from Disney called "Let it Go". People around the world made different translations just to sing that song. I also agree to what sanaybrown posted, it's a way people express their feelings.
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The higher the ISO the more light the image has
Debra is more likely than Rachel to be involved in physical activity. Since there are boys in her group, the group would usually be doing physical activity.