I want to know the answer to the following question:
What were CD-V's video capacities usually used for?
All the background I'm provided with is that "The original 1989 release of David Bowie's retrospective Sound + Vision CD box set prominently featured a CD-V video of Ashes to Ashes, and standalone promo CD-Vs featured the video, plus three audio tracks: "John, I'm Only Dancing", "Changes", and "The Supermen".". Is that enough to answer the question?