Hi Andy, here's from a post I made on the 3rd video, about how I understand the chords to work out:
I'm pretty sure Eddie's tuning is an A6 (low to high):
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F# A C# E F# A C# E
6 1 3 5 6 1 3 5 <-- The intervals in the A6 chord
In the examples he's at the 7th fret for an E chord.
So, when he does the first version of the 7th, (on strings 3, 4, 6) it is an E7 with a 9 added:
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C# E G# B C# E G# B
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G# D F# (3, b7, 2 = 9th)
The slant pivots about the 6th string, brings the 4th string up 1/2 step and the 3rd string up a whole step.
The second version of the 7th he plays at the 4 chord.
In Eddie's key of E example that is at A in the 12th fret.
In this case the 7th also has a 6 (or 13th) added:
(With this slant, relative to the A the notes are lowered so I wrote them above...)
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D G# C# (b7, 3, 6 = 13th)
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F# A C# E F# A C# E
You’re right that the root is missing (also the 5 is missing). I think this works out with the logic that the rest of the band will be playing the root and 5 (like the bass player), so when you’re making the more interesting chords you can just focus on the “extra†notes. I think it's important to get the 3 in there though, to help keep it major sounding.
I find the 2nd version to be really useful for turn arounds when there is a quick 5 -> 1 chord change. You are already at the easy position to play the root chord. You can hit the slant for the 5, and then slide (pivot?) and hit the same strings and get the root chord.(In this case you'd have to be playing in A, not E. So you start at the 5 (E) with the slant and get to the 1 (A)).
I’m open to any suggestions about how I’ve interpreted the chord theory