It’s a fairly simple concept (Might be a pain to develop, I’m not quite sure). But it mostly is just an earbuds equipable, could maybe have alternatives (jetpack style) such as headphones or such. It would operate like the media players, though only you would be able to hear it. It would just be for playing audio from youtube and soundcloud so nothing too crazy. At most maybe it would turn off the other music for you, the person listening to audio with your headphones.
That’s an amazing idea. Take my vote 