I have a question about post-bop progressions. Take Black Narcissus. The changes are
||: Ab-7 | Bb-7 | Ab-7 | Bb-7 |
Ab-7 | Bb-7 | Ab-7 | Bmaj7b5 |
F#-7 | G#-7| F#-7 | G#-7 |
F#-7 | G#-7| F#-7 | Amaj7b5 |
Ebmaj7b5 | Fmaj7b5 | Bbmaj7b5 | Cmaj7b5
Ebmaj7b5 | Fmaj7b5 Bbmaj7b5 | Gmaj7b5 Abmaj7b5 | Bbmaj7b5 Cmaj7b5 :||
I analyzed the first 8 bars mostly as, ii-iii in the corresponding ionian mode, so I would typically play using dorian or phyrgian. Could the maj7b5 at the end of the first two 8 bar phrases be seen as some type of altered dominant leading to the overall "ionian" tonality of the next 8 bars? F#m and G#m appear in E major, so Bmaj7b5 is some kind of lydian altered scale for E major. Should I be thinking in ionian, or dorian, using Abm and F#m as the roots instead of viewing them as ii?
The Amaj7b5 going into the last 8 bars, which start with Ebmaj7b5 also confused me. Since you can just consider the Eb lydian its own tonality, Bb7 would still be its dominant, so I tried "putting" A lydian over Bb mixolydian to see what kind of altered scale it produced.
The two scales have only two enharmonically common tones, Eb/D# and Ab/G#. I sort of viewed A lydian as E ionian, and Bb mixolydian as Eb ionian for convenience. So since Eb and D# are enharmonic, it was basically putting Eb(D#) locrian over Eb ionian or the other way, Ab(G#) phrygian over Ab lydian. So over this initial Amaj7b5 you can theoretically play Eb locrian or Ab phyrgian?
I'm also stumped with the last 8 bars. I know there's nothing diatonic that could fit over that, but it seems like the root notes all belong to Ab major. But I have no clue what that indicates.
Basically, is this tune supposed to function within "traditional" harmonic practices, and if so, how? If not, then how am I supposed to approach it and why?