A number of evangelists made a good living in the 70's and 80's preaching about the Satanic messages in certain Rock songs when played backwards. One of the most popular songs alleged to glorify Satan when reversed was Hotel California by the Eagles.
For the full version of this classic, see below:
Another song alleged to have Satanic messages wasStairway to Heaven by Led Zeppelin. See below:
Now to hear the full version of this classic song: