Saw this on fb earlier - a guy has done some analysis and produced a recording of what gets left behind when you compress a track to mp3.
So, yes, its a bit of a read, and you might agree or disagree with the methodology, but its interesting!
http://theghostinthemp3.com/theghostinthemp3.html
What an MP3 leaves behind
What an MP3 leaves behind
Do or do not, there is no try