Tag a SONG to it's oldest version

That’s possible, if MB has the exact same recording for both the later releases and the original 1955 release. If that’s the case the variable %_recording_firstreleasedate% can be used for setting the date.

See the docs for details:

https://picard-docs.musicbrainz.org/en/extending/scripts.html#use-original-release-date

And the following threads also contain some discussion around this feature:

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