J'ai eu cette partie de réponse sur un autre forum. Je poste le commentaire intégral. Si vous ne comprenez pas certaines phrases, faites-moi signe, mais je crois que c'est assez clair. Je ne comprends juste pas pourquoi le gars parle de partition "enharmoniquement erronée".
"Basically it's A minor - or A aeolian (natural minor) if you prefer.
The opening chord is Am11 (A-G-C-D-G, 1-b7-b3-4-b7).
The arpeggios in bars 3-6 are Am7, with a passing b6 (F) - indicating aeolian mode. (Although with the absence of either B or Bb, it could be phrygian.)
Bars 7-8. The notation here is enharmonically incorrect, but the chord arpeggios in each bar are Fm7, Gm7, Abmaj7 (roots, 3rds and 7ths only, no 5ths).
Bars 9-10. This is a string of sus2 chords. Again, the notation is enharmonically confused. The chords amount to Dbsus2-Absus2-Fsus2 in each bar.
The notes all the way through bars 7-10 come from the Ab major/F minor scale - but there is no firm tonal centre, no clear keynote. (Which is no big deal. The idea seems to be merely to outline another set of notes by sketching various arpeggios, rather than establish a clear new tonality.)
At bar 11 it's back to the Am tonality.
To improvise over this sequence, I would choose the A natural minor scale on the main part, moving to F natural minor on bars 7-10.
Or you could choose A phrygian on the Am section, which is a slightly closer scale to F minor. Depends how much you want the sections to sound different."
God hates us all!
