Modes in the 16th and 17th centuries
Why Music: Practice & Theory Stack Exchange recommends it
Music Stack Exchange answerers and commenters point people to it when questions ask about the history of modes, such as when the Ionian mode appeared, why Aeolian became the minor scale, or what plagal means in modal music.
Recommended by 3 people across 3 different months, 2017 to 2021.
What it is
A 17-minute explainer from the Early Music Sources channel, created by Elam Rotem and Oren Kirschenbaum, on how modes were understood and used in the 16th and 17th centuries. It covers the historical theories of modes and their names, and links to footnotes and further sources in the description.
What people said
Recommends Some_Guy · 2017-10 · Music: Practice & Theory Stack Exchange · on “Why is the aeolian mode the minor scale?”
Those who enjoy and find this answer interesting may enjoy the following 2 videos from "early music sources" which talk, respectively, about the evolution of modes into the modern "major" and "minor" scales, and about the concept of the hexachord [this video] [LINK]
Recommends user57228 · 2019-02 · Music: Practice & Theory Stack Exchange · on “When was the Ionian scale invented?”
The history of modes isn't a very linear and neat process, so it's not necessarily easy to pinpoint an invention date. The YouTube channel Early Music Sources has a good video [this video] on the history of modes where the talk about the various historical theories of modes and their names (the ionian is first mentioned at around three minutes in). The video description has a link to further sources if you want to dig deeper.
Recommends Elements In Space · 2021-10 · Music: Practice & Theory Stack Exchange · on “What does "plagal" actually mean for modal music and melody generally”
I think this video by Elam Rotem is probably what you are looking for: Modes in the 16th and 17th centuries [this video]