Loudness then & Loudness Now - What is Loudness Normalization in the 2020s?

What is a UPC/EAN and how do I get one ( a barcode to you and me)

What is an ISRC (International Standard Recording Code) and how do I get one?

How long can mastering take?

What is Mastering for CD?

Why you should not send compressed mixes to your mastering engineer...