Catalina Vicens - Medieval Organ c.1425-1430 Ostönnen / Mit Ganzem Willen 

Hungaryan historical organ (1685), Renaissance musik: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dqTDJYRi6QQ.html

Hungaryan historical organ (1685), Renaissance musik: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dqTDJYRi6QQ.html

Hungaryan historical organ (1685), Renaissance musik: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dqTDJYRi6QQ.html

Hungaryan historical organ (1685), Renaissance musik: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dqTDJYRi6QQ.html

I don't think I heard that chord in this piece, but I think you might be referring to what we might call the first inversion minor chord that occurs for example at 1:44. This piece is in the medieval/Renaissance style called fauxbourdon, which is characterized by the frequent parallel 1st-inversion chords (top voice is a perfect 4th higher than the middle; bottom voice is a diatonic 6th away from the top voice). The cool chord happens at cadences. Since this is in Dorian mode (D E F G A B C), the 7th in the diatonic scale is what we would call a "minor seventh". In this style, at cadences the leading tone is essential in order to get that half-step resolution to the final (or tonic): (D E F G A B *C#*). If the seventh is altered to a leading tone, just carry that change over to the rest of the voices in the style. The middle voice has to be a perfect 4th from the top, so it becomes G#. The lower voice is a 6th away, which is E. The final result is E-G#-C#, which to our modern ears sounds like a 1st inversion minor triad a half-step below the tonic chord (though they weren't thinking about it that way). Cheers!

@@KennyRegan Wow. Just wow.

@@KennyRegan he means the one at 0:09

@@tomatoso27 oh I see now haha! Silly me, I went on that long spiel for nothing lol. Well that just looks like what we would call a first inversion a minor triad in modern music theory, but here it sounds more complex because it seems like maybe the organ has some prominent 5ths in its registration (e.g. if you just play a C, you'd also hear a G coming from the organ). So the effect to our ears is C(G)-E(B)-A(E), which sounds to our ears somewhat like what we'd call a minor 9th chord.

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Here is Schlick. You can hear it in modified Pythagorean in the following recording store.consouling.be/products/organic-creatures?_pos=1&_sid=d6cf03c24&_ss=r

This is a type of keyboard score called Old German Organ Tablature.