The idea is simple. You would have 2 options. Enable/disable eavesdropping and enable/disable to be eavesdropped.
If you enable eavesdropping, you will be able to eavesdrop all devices nearby that have their device enabled to be eavesdropped and you can see what they listen at the moment. Imagine how many different songs would you be able to hear that other people listen to? Ultimate source of new songs. From heavy metal from that guy with the military bombers and a leather jacket, to some new rap music from that guy that acts all cool in the bus. Possibilities are endless.
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