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Just now, The Folk Prophet said:

On a much more simplistic level, this reminds me of the way they taught Aug 6th chords in school vs. when I actually had the "aha" moment and realized how they really work.

So don't leave us hanging! Tell us! How DO augmented sixth (or maybe August 6) chords work?

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32 minutes ago, Vort said:

Unpack, please. (Seriously. I want to know.)

So let's take the key of C for ease's sake:

A dominant V7 chord has the notes G, B, D, F in it. The B to the F is a tri-tone.

A tri-tone is the one interval in the 12 options that is exactly half way. That means it's exactly the same upside-down as it is right side up. In other words, a 4th upside down becomes a 5th. A 3rd becomes a 6th, etc., but a tri-tone becomes a tri-tone. It's the same interval either way.

The tri-tone causes strong dissonance that the ear likes to hear resolved. The dominant chord is enhanced by that addition of a flated 7, which, among other things, creates a tri-tone between the 3rd and the flat 7.

In a dominant chord it resolves inward (in 1st inversion). So in our chord - G, B, D, F - the B goes a half step up to the C and then F goes a half step down to the E - resolving to the Tonic - C, E, G.

The Augmented 6th chord is the exact same structure (with variation, depending on type) as a dominant 7 chord. Aug 6 is the same as Flat 7, if you follow. What makes an Aug 6 chord an Aug 6 chord instead of a Flated 7 (Dominant 7) chord is the way the tri-tone is resolved. Because you can turn it upside down and it's the same notes, but then you still resolve it inward by a half step -- but now it goes to different notes: The F goes up a half step to the F# and the B goes down a half step to a Bb.

In practice, that means that the reverse resolution goes to a chord a half-step below where the Aug 6th was, and instead of acting like a Dominant chord it acts like a alternative to a Sub-Dominant* chord.

Explaining the "feel" of Dominant vs. Sub-Dominant is a bit like explaining how Salt tastes though.

*Edit: Wikipedia used the term "predominant"

Edited by The Folk Prophet
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26 minutes ago, mordorbund said:

I had to like the clip because of the face Doga made at 4:22.

He made that face because the guy is wrong. I don't care if that's how the format developer says it; "Jif" is what I make sandwiches out of. It's not a Giraffical Image Format.

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Hipparchus used epicycles back in 150 BC to predict solar eclipses and create a working model of the solar system.  His Antikythera mechanism pictured below on the left with moder day attempted recreations.

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Prolemy expanded on Hipparchus model with many more epicycles to create an accurate model of the geocentric solar system including the 5 main planets in 150  AD.  Ptolemy’s model is still used today in mechanical clocks like the astronomical clock tower in Prague

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Pretty cool old technology.

 

 

 

Edited by mikbone
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