[PROBLEM] RPi 5 + RPi M.2 HAT+ + IQAudio DigiAMP

[Tim Curtis]

To me it looks like all those filenames with apostrophes are making MPD's life harder than needed.
I'd rename them, either removing the apostrophe at all\, or substituting it with an underscore. The Artist, album and track name are in the metadata, and that's what MPD uses; so the filename could actually just be a.flac...

Do you mean in the output of ls ??

They are not actually part of the filename but ls adds the quotes of the output can be safely piped.