Battery Saving Headphone Gyroscopes

Pretty simple this. When you're walking on your own somewhere, you'll be listening to music with both headphones. But, if you happen to be walking somewhere with a friend, and you want to talk to them but still listen to your tunes, you'll only use one headphone. The unused headphone, however, is dangling somewhere around your torso, still playing music for no reason, wasting valuable battery life. I think headphones could be equipped with small gyroscopes that can detect what angle the headphones are at. If they are at the sort of angle common to being in someone's ear, then they play music. If they are 180 degrees away from that, then they are probably just dangling somewhere, out of use. The gyrsoscope could detect this, and would stop playing music, saving battery life. I originally thought of having a button on music playing devices to choose to only play in one ear, but that meant that every time you changed which ear you were listening with, you'd have to change which ear it was playing through. The gyroscopes mean you can freely switch between the left and right headphones, but you can't listen to music upside-down