That exists. They are called Mico and is based on the analysis of our brainwaves to operate
Neurowear The Japanese company is working on a revolutionary headphones that sense the user’s mood and choose songs from your playlist according to this.
Mico, which is how they know this project is not yet commercialized, has a sensor that goes in the front and analyzes the user’s brain waves, then sending a signal to our mobile devices.
Before use, we must choose from the list of songs which are suitable for every mood, so that when the sensor sends a signal to the application detects this change automatically just what our mood.
While it has not been commercialized so far, Mico was presented at the South by Southwest convention.
.