Ace Frahm says:
"At 17:51, you incorrectly state that each person heard on the track should have their own Artist tag. Artist is a singleton tag, according to the specification."

I dispute this - if you go to directly to the actual specification at https://xiph.org/vorbis/doc/v-comment.html, you will find this:

"Field names are not required to be unique (occur once) within a comment header. As an example, assume a track was recorded by three well know artists; the following is permissible, and encouraged:

              ARTIST=Dizzy Gillespie 
              ARTIST=Sonny Rollins 
              ARTIST=Sonny Stitt"

Worth a mention as a "point of contention" in a followup though - I'm less inclined to give broken old software that doesn't correctly support the specification a pass, but it is true that an awful lot of software (including VLC) is still stuck in "one value per tag" mode.