Comment 11 for bug 911743

> - Advanced mp3 tags - can be handled by id3. Mixxx should be able to read useful non-standard tags, such as the musicbrainz tags that Picard inserts.

Good point. Can you file this to a separate bug and give more details?

> The biggest problem related to leaving tagging to an external app is that if a track file is renamed, all of the Mixxx data is lost. The best way to deal with this would be to ID tracks based on a hash of the actual sound data, instead of the file name.

Thanks to Max, MIxxx has made great progress in finding renamed track.

See e.g.:
Bug #804700 Automatically identify songs using fingerprinting methods and lookup/clean metadata from online-sources (e.g. MusicBrainz)

It would be a great help, if you could test the latest master version from https://github.com/mixxxdj/mixxx/ against your use cases. Instructions: http://www.mixxx.org/wiki/doku.php/start#build_mixxx