Editing Toaru Majutsu no Index:RailgunSS3 Chapter8 (section)

===Part 2===

Now.

Did you know the well-known Do Re Mi scale was “designed” using math? For example, if you call the base string Do and halve the length of the string, then you have moved up an octave. In other words, you have moved through the entire Do Re Mi Fa Sol La Ti Do scale to reach that next Do up. And if you shorten the base string by two-thirds, you end up with Sol. Knowing those two facts is enough to fill in the entire scale with halves and two-thirds. The idea dates back to Pythagoras.

And while the ancient alchemists played with glass test tubes in an attempt to separate the elements, it is said they used Pythagoras’s arrangement of the seven planetary symbols along the Do Re Mi Fa Sol La Ti Do scale to preserve their secret techniques in a form the ignorant would not recognize. It is fairly well-known that Heinrich Khunrath’s lab contained musical instruments right alongside the more traditional lab equipment like pots, stills, and bellows.

Playing music was enough for ''a special power'' to gather.

For that matter, the practitioner’s own body could be seen as an instrument as they send vibrations through it to recite incantations.

So.

What did that mean?