Backmasking: Old theory, new spin

It is one of our most enduring conspiracy theories: Rock 'n' roll albums often contain intentionally reverse-recorded messages from the dark side.

Now nearly four decades old, the debate over so-called "backmasking" has been resurrected thanks to the advent of digital music and easy-to-use editing software. No more spinning that vinyl record backward on a turntable: Satan, apparently, has gone binary.