+1

Just to comment from a pure harmony point of view.
By itself a lonely Abmaj7/Eb has no sense.
It take full sense here in Naima theme, because we have a Eb pedal played by the bass over several chords.
Later in the song, we have a Bb pedal.

I had a look to the piano chords. See attached picture.
The 'Abmaj7/Eb' is realized with 4 notes, that are, from the bottom to the top : F#, G#, A, C#.
Some scores feature this schord as a B13, with no root as the 1st bar (Bbm9/no root). It can seen also as a F#m(add2). The difficulty with BIAB, it to get only these notes, so try different chord namings until to get the right notes.


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