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			In Psychology we learned that the longer you hear noise the more it hurts your ears.  People who live near highways (like I do) or on busy streets in cities such as people who live in an apartment normally have worse hearing.  The sound of cars going by isn't very loud, but since it is constant, your ears are constantly working until the point where they start giving up.
 However, if you listen to something SO loud that your eardrum bursts, that's when you're in trouble because scar tissue will develop to replace it which makes hearing harder and harder.
 
 They've actually found that constant noise might lead to earlier death :p.  Buttt... I imagine that's still in testing or we'd know more about it.  But it's nothing I would spend my life worrying about.  I love music too and I'm not going to stop listening to it just because it's damaging my hearing (unless it's to the point where I might go deaf).
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