Looking for something that can be used to listen to music, or not, that will keep noise out. I'm sitting at a coffee shop and their music is incredibly loud. They don't seem to be interested in turning it down because it sounds fine up at the front. I would like to find something that would keep the noise out, whether I have it plugged in to listen to music or not. Bose has some ( http://www.bose.com/controller?event=DTC_LINKS_TARGET_EVENT&DTCLinkID=2724&perfsourceid=k15318&src=k15318 ) but I'm not spending anywhere near that much.