Subliminals
Subliminals sound like any other audio, as though there is just music or sounds playing. That's because the vocal audio is played at a decibel level just out of your conscious mind's notice, while being very much in the range of your subconscious mind's attention. Because the filtering nature of your conscious mind can't critique or defend against the suggestions playing outside of it's notice, your subconscious mind absorbs my words without resistance.