This would be a really fun thing for audio enthusiasts to try, OR if you would just want to try and see if you can hear the difference between a 320 kbps track, and a 128 kbps track. (:
I got it right the first time, it was rather obvious in some bits and I was just using my mere lousy computer speakers at home. The distinction is probably clearer if I use better equipment..
Meanwhile, go try and have fun! :D