With Musical Cryptography, Composers Can Hide Messages in Their Melodies

This might be a widely known secret by now, but here's an example of musician Aphex Twin hiding his face in a spectrogram of one of his songs: https://www.youtube.com/watch?v=M9xMuPWAZW8

I think “steganography” is a more precise term for this than “cryptography”

Here's a story about some real life steganography using guitar riffs to hide morse code in a pop song to message hostages:

https://www.theverge.com/2015/1/7/7483235/the-code-colombian...

(It has been on HN before but not recently I think.)

I've failed to find it in either Leibniz

https://hal.archives-ouvertes.fr/ads-00104781/document

or Napier (Rabdologiæ), but at some point I'd read a (seven-/eighteenth century) paper which explicitly called out steganography as an application of binary encodings.

I've been saying it for years, audio files on minidisc are the safest way to travel.

How many years, exactly?

Expected the answer communicated through song.

https://en.wikipedia.org/wiki/OpenPuff