I remember using something slightly similar (Though more rudimentary) in my final year Computer Forensics degree. The task was to leave a 'breadcrumb trail' of evidence for another group leading to files that would condemn us as child sex traffickers. Our group hid the password to a certain archive file in a single track of a Cannibal Corpse album. I think the track was 'Festering in the Crypt'. When the track was viewed as a wave graph, the password was clearly visible. Much fun was had leaving subtle hints to our counter group that they had to listen to the whole album backwards to glean the password. I don't think they ever solved it. Cannibal Corpse was selected because any distortion from changing the wavelengths to hide the password would be very hard to pick up.