Comment by KwanEsq

Yeah audio CDs do (or at least can) carry those bare bones of metadata, which can be used by some CD players with built-in displays to display the currently playing track title etc.

It's defined by the CD-Text extension[0] to the Red Book standard.

I think classical releases probably make greater use of it to encode things like composer and arranger, since they are more important to that audience, but for the average popular music release you're only going to get the artist and title, and maybe the ISRC that few are going to care about/display anyway.

[0] https://en.wikipedia.org/wiki/CD-Text