Random anecdote: There was Video Cd, but also CD Video. CD video had both an (inner) CD part with audio, as well as a Laserdisc part which would usually contain a music video. Very weird format, but cool to have both analog and digital storage in one medium.
There was also CD+Graphics which encoded graphical information in a subchannel not used by CD audio. It ended up providing about 28kbps of data for the graphics. It is used for karaoke but some commercial albums were released that displayed images of the bands and stuff when played on a compatible player.
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