Hi Tomo,
For the chord progression, you play B-7(b5) | E7 | A-7. But I was expecting to see an Emin7 since I recently did the diatonic 7th chord lesson :)
Why choose E7 rather than Emin7 ?
The E7 has a G# which is not diatonic to C Major scale, correct? I notice that it creates a little descending chromatic thing during the chord progression which is nice (A to G# to G).
Thanks,
Anthony
This is my understanding: The basic idea is that E7 resolves more strongly to Am7. Agree the relative minor gives you an Aeolian mode and thus the diatonic Em7. This is a weak resolution as a V-I progression. As a result harmonic minor was created to give you the G# in the V chord making it a stronger resolution. Unfortunately (or fortunately) harmonic minor then contains an interval of 3 semi tones (half steps) between VI and VII which is very distinctive of harmonic minor. Subsequently melodic minor was invented which makes the b6 natural rather than flattened, thus you remove the giant step of 3 semi tones with melodic minor.