All my music disappeared. No more library file. What the f happened??! Help please!

UP!!

April 22nd and it is STILL happening. This time, none of my manually backed up "Music Library.musiclibrary" files are doing the trick. Has ANYONE found a solution for this really annoying problem? I've just lost 400GB of organized music... Please, help.

I ended up finding a workaround inspired by one of my previous posts. Given your particular situation, I doubt it will be of any help; I'm still putting it down here for the general public (and we must be legion).

First, and that's paramount, back up your "Music Library.musiclibrary" weekly (I'm now doing it daily) and keep these copies safely tucked away. Second, when you encounter an empty library upon opening Music, try restoring your "Music Library.musiclibrary" from one of the previous copies you've kept safe. If it works, great. For some reason I'm not entirely sure of having grasped, some copies might work, some might not. There might also be a time when none of your copies do the trick, which should be impossible, especially if you've already used one of them to save you once. This ought to make you turn to the last solution, which is Safe-booting. Not being a specialist, I won't delve into my interpretation as to the whys. Nonetheless, safe-boot when nothing works anymore and try again in that more secured environment. At this point, you might have an intuition about which copies would have remained free of corruption in theory, if one or more have done the trick previously; focus on these. If it works at this point, great. I have, however, encountered occurrences when none worked, even in Safe-boot mode. In these instances, it felt like they all somehow got corrupted. So while remaining in safe-boot, what I did in that case, was get under the hood of each copies I had kept until I somehow managed to rebuild a "Music Library.musiclibrary" file containing *.tmp files that made sense (e.g. in these extreme cases, you might find that some of your temp files have gone missing, or that their amount is frankly ridiculous, or that some of them have "weird" sizes in relation to others) and Libraries with appropriate looking-size, using all of the copies I had at my disposal (hence the impracticality of this here solution if you have never made any manual copies of your "Music Library.musiclibrary" file).

This last operation did the trick for the worst case of Disappearing Library I've encountered so far. So obviously, nothing is really technical in this solution. I'm not an expert. Still, having successfully managed to retrieve all of my Playlists, Playcounts, Star Ratings and, most importantly, organized Music, I guess that one could say that I've accomplished something Apple Music makers haven't been able to do in –– ever. You're welcome.

Maybe someone should pin this post.

Anyone??

Also tried after further reading : rebooting in secure mode and fiddling with Music's inner settings; all to no avail.

I almost wrote "already tried tt2's usual answer" in the op. Any other ideas? I need these playlists as they were.

Have you found something tt2? It is STILL happening..