Sub is not a single light music. It consists of three elements: images (mostly still pictures), sounds (mostly fixed BGM, sounds or soundtracks) and "affirmative words" (which can also be non-affirmative guiding words or even specific texts of non-guiding words), which can form a deep impression in memory.
On the spiritual level, sub is implanted with information flow through the subconscious, so as to adjust its magnetic field frequency to a better state, so as to achieve the most harmonious state with the natural universe frequency. At the right time, a wonderful little miracle happened.