Still can’t figure out why the SD card that has all my music on it isn’t recognized by the Raspberry Pi 4. It worked until the first software upgrade on the Pi. I guess that’s the first thing to dig into. Next thing to check is the music server itself, although I don’t think that’s the main problem. Maybe it’s time to dig out an external hard drive to see if the problem is storing the music files on the SD card instead of the drive. Baffled.