well this technique has been there for a while now and its called Back Masking, and is being normally used by rock bands..
Some muslims have got so much free time to figure out such stuff and then post on youtube to scare so called muslims stupidly.
dude dont get excited, this technique was not developed by some muslim, so your statement is totally out of place..
i agree, no one in his right mind would listen to a song backwards, but those who are aware of this technique would surely do!
here is more from wikipedia on the same technique!
Back Masking
P.S. i would rather take this thread as a piece of information rather than getting all worked up and start bashing the poster. We all know people normally wouldn't listen to their favourite songs backwards, but at the same time we should also be cognizant of the fact that there does exist a technique through which cryp[tic messages are or can be delivered..