Updating iTunes Match metadata/tags?

I recently turned Match on in iTunes, and it did its thing and matched/uploaded songs. I then turned it on in my iPhone and to my horror, the tags that I thought I had meticulously organized weren't quite so perfect... mostly due to the "Album Artist" tag.

For example, the artist list in my iPhone now displays both “Smashing Pumpkins” and “The Smashing Pumpkins”. I went back to iTunes, corrected all the issues I could find, and hit “Update iTunes Match”, thinking this would send in my corrected tags.

Once it finished, I checked my phone to find that nothing had changed. I then checked back in iTunes to find that it had actually uncorrected the tags I just fixed. They're now back to the way they were when I sent them into Match.

Is there a way to get Match to recognize changes to ID3 tags, or am I forever stuck with what I've got?

I had a similar issue, it seems as once the song is uploaded to iCloud via iTunes match it becomes the "Master" copy. Install iTunes 10.5.1 or later on another PC and connect it to iTunes Match but DO NOT download anything! Then you can delete songs from iCloud, don't worry this won't delete them from your main iTunes library. Once deleted go back to your main iTunes machine and change the metadata, then choose add to iCloud for the song. The new metadata will now be ULd to iCloud.

I've had success with a slighly different approach which (as a plus) doesn't require re-adding all your tracks.

First, I turned off iTunes Match on my iMac (desktop) where my library resides. Then, I cleaned up all my metadata.

Next, I went to my Macbook Air (laptop), opened iTunes, went into iTunes Match, and deleted everything. As earlier posts have pointed out, despite the warnings iTunes gives you, this does not have the effect of deleting anything out of your local iTunes library (on my iMac, in my case).

Go back into iTunes on my desktop, and turn on iTunes Match. This starts the standard 3 step process, which finishes pretty quickly (in my case - my library is ~8k songs).

When it's done, all my tracks have been re-associated w/ iTunes Match, and have taken the new metadata assigned to them. Confirmed by going back to my laptop, quitting out of iTunes and re-launching, and waiting for iTunes Match to sync. After sync, my library appears, and contains the updated metadata.

Would be interested to know if this works for anybody else!