Without trying to sound like one of those obsessed over conspiracy theories, I want to mention a few points
-Wikipedia defines back-masking as a recording technique in which a sound or message is recorded backward on to a track that is meant to be played forward. Backmasking is a deliberate process, whereas a message found through phonetic reversal may be unintentional.
Good and fine, now what is its potential effect? Another quote from Wikipedia- Serial killer Richard Ramirez, on trial in 1988, stated that AC/DC's music, and specifically the song "Night Prowler" on Highway to Hell, inspired him to commit murder. Reverse sheep advocate David John Oates claimed that "Highway to Hell", on the same album, contains backmasked messages including "I'm the law", "my name is Lucifer", and "she belongs in hell". AC/DC's Angus Young responded that "you didn't need to play [the album] backwards, because we never hid [the messages]. We'd call an album Highway To Hell, there it was right in front of them." The implication of this material (and other information on the website) (you should check it out) is that subliminal messages can enhance preconceived ideas. If you wanted to murder, but weren't sure, for example, a subliminal message could help make up your mind.
You might argue that as Christians we wouldn't have these preconceptions. True, but then, why involve yourself with people who probably do?
Quickly on to my next and final point-
Ever heard about the (evil) 3rd eye? If you listen to Ab-soul and his crew, or Joey Bad*** (both labeled as the 'next big things' in rap) you probably have.
The refrain of 'Enter the void' (the name itself...) (a song by both aforementioned)
Enter the void
This for my hundred dollar businesses to destroy
Spreading word of knowledge to through decoys
People realize that it's time to deploy
Stay on point - open your third eye, boy
(And keep your mother... Chakras open
Keep your mother... Chakras open
Keep your mouth shut and keep your mother... Chakras open
Keep your all seeing eye open)
Just a jumbled collection of my thoughts.