DESCRIPTION:
We know the interval of a tritone today as "diabolus in musica," or the devil in music, but was it really always associated with evil? Are all of those metal musicians right in thinking that this interval is the sound of evil incarnate?

Some of the cool things referenced in this video

Liszt - Dante Sonata
https://www.youtube.com/watch?v=KB59i99Wxc4

A great history of the concepts of "soft" and "hard" in the Renaissance (tangentially related to hexachords)
https://www.youtube.com/watch?v=Fdj-WPCgD8c



That Pérotin piece with the tritones -
https://www.youtube.com/watch?v=taB6Yc-_zcY

AMAZING resource on tritones in medieval music. Seriously, the entire genesis of this video came from reading this short little essay.
http://www.medieval.org/emfaq/harmony/tritone.html

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Peace,

Adam