The big companies like Norton and Mcafee haven't even included this new type of virus in their database yet .
Also , most virusscanners are set to only scan files containing executable code like dll , exe , vbs , xls , ...
This is default behavior to save CPU time .
So even when their scanner is able to recognize "bad" code without updated virus definitions it won't be looking at files with the .mp3 extension .
And most people don't even know there is an options screen in their scanner so don't exept them to change it .
BTW do you have any clue of how many people actually update their scanners ?
90% you say ? Try more like 5% !

So you can stick your virusscanner up your *** .
"Think before you post , OK ?"