Enigma Variations
en.wikipedia.org
en.wikipedia.org
One I spent a bit of time on was Max Richter's cipher from his album Infra which uses a morse code shorthand that I wasn't able to recover, but it appeared to contain something like a PO box address at one point. I don't have an ear for morse, so I relied on using audacity to isolate the track and then variations of automatic analysis to yield something. The challenge with artistic ciphers is they can be impressionistic. There appeared to be a time lapse of images from 9/11 in the spectrogram of the Infra pieces, and a winding path that I thought might have been a bus route along the Thames from 7/7, but again because it's impressionistic, it's really hard to verify, and I can't imagine him letting on if someone got it right anyway. The morse seems like the only verifiable part.
Aphex Twin's famous "face" spectrogram is just the most famous example of a whole bunch of puzzles produced by artists in that genre under various aliases and pseudonyms. The project "Gescom" (which claims members of groups like Future Sound of London, who Richter also once collaborated with) made what are kind of etudes for electronic music production, where with a tool like Audacity or ffmpeg, you can reverse and unfold some of the samples to yield their original form, and in doing so, you can hear how the glitches and industrial sounds are made.
Maybe there is some future project where we can use ML and some kind of conditional entropy filter on the tracks in these songs (and perhaps even Elgar's variations) to do feature extraction and identify artifacts of intent from noise, and then potentially unfold what these artists folded into their work. I've also been working on something similar with Arvo Part's work, which is also alleged to be procedural, and have had a bit more success with it, and there are others who have written about it but again, difficult to verify. Fascinating topic.
https://www.wired.com/2002/05/hey-whos-that-face-in-my-song/
1. In the UK there was a TV detective series called "Inspector Morse". The composer of the theme music (Barrington PHeloung) included "Morse" in morse code in the theme. They then decided to start including clues in morse in the theme music behind episodes including red herrings so if you decoded the clue it might send you down the wrong avenue[1]
2. There are a number of cryptograms in the music of Alban Berg, including several suspected but which have never definitively been solved. An example which is like a crossword as you have put it would be in the violin concerto the choice of the famous corale and the way in which the text of the Bach cantata with the same corale ("Blessed are those who die in the Lord") refers to the dead child (Manon Gropius) the concerto was dedicated to. Getting that particular example to work is an amazing feat of musical architecture because the violin concerto is a serialist piece so he had to include the right part of the corale into the tone series for the piece in order to make it work[2]. It's also just an incredible piece of music in general
[1] https://www.classicfm.com/discover-music/periods-genres/film... [2] https://web.archive.org/web/20171107012243/https://www.laphi...
One of the most beautiful uses of music in a movie in recent memory, IMO.
[0] https://en.wikipedia.org/wiki/Benjamin_Wallfisch#As_composer...