Bone conduction headphones will allow music to be transmitted through your skull, not your ear.
StudioBananaThings call it the Batband, and it utilises the same technology as hearing aids, sending vibrations through your bone structure.
The Batband pulsates music to your inner ear, leaving the outer ear free to listen. We’re curious as to what this sort of crossover would sound like, and how disorientating it may be.
Batband has successfully completed a kickstarter campaign, so expect to see these rolling out very soon.
https://www.youtube.com/watch?v=ozTiogpOol8