The idea itself definitely sounds familiar... (Score 1)

It would make a much better story though if suddenly the same trained people start recognizing what's wrong with this whole world simply by listening to most popular chart hits :) Seriously though, while the approach itself sounds like fun, it will never prove itself more useful than the textual data we all rely on as there will be no easy way for you to quickly find the necessary piece of information in the audio stream... Fast forward, anyone?! ;) I don't think so :) It's still much easier to Ctrl+F things...