European union is working on a plan to restrict the default level of volume in a MP3 player, when EU introduces this plan it is most likely the rest of the world would follow soon. Though this default setting can be overridden, it is likely that 80% of users would not bother to change the settings.
EU plans a mandatory default level of 80 decibels as the maximum volume and another option to override this will also be provided. The long term impact of loud music includes permanent hearing loss, Headaches and irritability.