 Various fundamentalist Christian groups have declared that Satan — or Satan @-@ influenced musicians — use backmasked messages to subliminally alter behavior . Pastor Gary Greenwald claimed that subliminal messages backmasked into rock music induce listeners towards sex and drug use . Minister Jacob Aranza wrote in his 1982 book Backward Masking Unmasked that rock groups " are using backmasking to convey satanic and drug related messages to the subconscious . " Christian DJ Michael Mills argued in 1981 that " the subconscious mind is being successfully affected by the repetition of beat and lyrics — being affected through a subliminal message . " Mills has toured America warning Christian parents about subliminal messages in rock music . 
