malahchi

This should be NSFL.

such as Jazz and Electronic as this cannot be written down

Some people do write them down. Adam Neely did a video in which he explains how he wrote down electronic music and explains a few different systems of writing down weird things.

Everything can be written down. We just need word or signs that explain the sound. We can write the frequencies, the texture of the sound (smooth, shrill...), its power level compared to other instruments, etc.

Eg: if I represent on a score a very round sound that begins at 20 Hz and increases by one octave per second, with some practice you can understand that it begins so low-pitched that you could nearly feel it as a rhythm rather than a note ; that by 4 to 5 seconds, it's medium-pitched ; and that by 10 seconds it's so high that few people can perceive it anymore.