The sound leaking out of headphones causes trouble for a person around you. You might have been using a closed type or canal type of headphones to avoid sound leakage. But, these types of headphones are would also interfere with that you listen to the sound around yourself (even your own voice). - If you are talking to someone next while listening to music by the headphone, you would speak with profusely big voice. - When you are listening to music while you wait your order of your medical exam