Where can I buy CDs of popular music?
It's the more esoteric artists that have become increasingly difficult to get CDs for. Streaming is really a boon for anything outside the mainstream.
I seem to recall that meant they weren't actually CDs, they just happened to look exactly like them, and usually function in a CD player. Computers often had trouble with them.
I don't know if this is true, or just bs, but there you go.