I believe that teens can listen to music at any volume in moderation, there are studies shown that teens can listen to 2 songs at full volume with earbuds without having any hearing damage on a daily basis. I think that it is up to teens to be responsible with their music use, and there are definitely certain times music is okay and certain times it is not. For example, in a quiet environment, one should not have their earbuds turned up so loud others can hear their music.