Thanks, I still have the CDs but I don't have a CD/DVD player anymore since I bought a new iMac and sold the old one. I still have my old HiFi CD player but that one is too old to connect to anything except an amplifier.If you’ve still got them, re-rip the CDs. Did you do that conversion/match thing Apple offered many years ago now? Don‘t remember the name of it. If you did, maybe something went wrong. I suspect you’ve got precious classical recordings that aren’t even available for streaming. Could be some wonkiness there. Good luck. And I’d call Apple. You never know.
I tried deleting and re-importing an album from the files I kept on my NAS but that didn't help.
I only have a few recordings that are rare, the rest is pretty standard. So I could search them and put them in my library. A bit tedious and not something I had in mind when I was going to use the Classical app 😊 But probably I will do that when all other options fail.