Songs are missing from my Music app
I discovered that lots of songs I thought were on my iPad were missing. When I got back to my Wi-Fi, I told my iPad, my iPhone, and my iMac to download them. I also saw that my HomePod was stopping playing songs after playing a few, which doesn't normally happen.
I found that the Music app on my iMac didn't think I was logged onto Apple Music, so I logged in again. This happens a lot, which I discover when I look for a song and "Apple Music" is not an option.
Telling my Mac to download all my songs, I keep getting errors like this (with a song that I play often and had long before I had Apple Music):
How do I get my music back from Apple Music when it disappears?
iMac Line (2012 and Later)