The original release date must
be the earliest date that the original product was first released, regardless
of the releasing label or format type (for example LP, CD, or digital release).
External data sources can be scraped and used as reference, such as
MusicBrainz, Wikipedia, Discogs, etc.
The same applies to
audiobooks:
The original release date of audiobooks must be the
date the book was first published, regardless of format (Book, eBook,
Audiobook, etc.).
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