In an effort to help those that cannot hear or even change the listening experience altogether, technological advances are afoot. The mind boggles!

http://i100.independent.co.uk/article/the-device-that-helps-you-hear-through-your-tongue–eJ-W7Wcfng

http://www.popsci.com/technology/article/2012-05/play-grill-lets-playas-hear-music-through-their-teeth