Songs that have had their metadata changed in iTunes have disappeared from my iPhone

The answer was ''Thank you for the information provided. We'd like to clarify that editing metadata from music directly from the Apple Music catalogue might have some unintended consequences. As you have previously confirmed, the music you're adding to your Library comes directly from the Apple Music catalogue in the iCloud Music Library. Once you edit that music and it reaches back to our server, it will have a mismatch with its metadata and can cause issues like the one you're currently experiencing. We'd suggest you to remove and add back from your library any music that's currently having issues and avoid editing the metadata to prevent further problems. ''

That's not an option. I'm afraid editing metadata won't be possible on future updates of Apple Music, since it's easier for them to avoid editing than looking for an ACTUAL solution.

In my case, I had a long conversation via Twitter DM with Apple Music and they even called me. They told me they were telling the engineers, but that was some weeks ago.

As I said at the beginning of this discussion, editing tags is one of the main reasons I chose Apple Music as my favorite streaming platform, because it's the nearest thing to having an offline MP3/M4A/whatever music library.

Also, some months ago there was a bug/issue/mistake that messed up a lot of Spanish songs on iTunes Store (and now Apple Music) by léávíng sóme of thém tágged liké thís, which was extremely annoying and a total mess for LastFM. Not being able to manually fix it would be a reason for me to consider unsubscribing.

The 'match' technology used to identify the tracks should be audio-based and not tag-based, which leads to common issues as the ones we're talking about or, not less important, the wrong matches to different versions/remixes/edits of a song.

PS. Please excuse my English!

I am happy to report that everything appears to working properly now. I had previously fixed all my bad/missing data by hand - a long and soul-sucking process - so I can't say if it fixes older missing data, but I can now add and edit Apple Music song titles in my library without it wreaking havoc on my metadata across my desktop and mobile devices.

Huzzah!

I've been following this thread since experiencing the same problems, and thought I would 'poke my head in'.

I've just added a new album to my library from Apple Music, and after editing much of the metadata (including the track names of almost the entire album), everything updated on Music on my iPhone near instantaneously! So, like Jeremy says, fingers crossed everything is fixed.

The problem is almost completely resolved, but one minor issue remains. If you try to remove a grouping of tracks (say, for example, a concerto in an album of classical music), the name of the grouping goes but the artist remains, so the tracks remain grouped, but without a name. Not a big deal, but again this is a piece of metadata, like the track time, which cannot be amended manually so there is no workaround that I can figure out.

Incidentally, the track times that were lost when changing track names (see above) do now reappear when the tracks in question are played, although it takes a minute or two of each track for it to happen.