I’ve had great success with Plex configured to use embedded metadata. I wrote the following to help out with the process:
[HowTo] Configure Plex to use embedded metadata (music)
Keep in mind that Plex doesn’t use all embedded tags. Most notably, it does not support the Composer tag, which is essential for properly-tagged classical music. The workaround is to use the Composer as Album Artist.
This feature request lists a large part of what tags are used, which tags are partially supported, and tags that I hope Plex will add support for.
