But did the song begin with the melody or what the chords?
Another Tyla's song with a simple but, kind of, interesting chord vamping.
That song got my attention due to its subtle (percussion-based) rhythmic pattern.
The original bass line from that song is not bad, but the percussion part allows me to "imagine/re-imagine" a new and subtle bass rhythmic "breathing." And it's
NOT about "what-other-notes" to play, it's about rhythmically-nuanced, subtle bass pattern based primarily on the root, the 5th, and Octave.
With Bbmin7(11), it OK to incorporate Eb as 11th.
The song has just two chords: Abmin9 and Bmin7(11).
All the notes of the melody are strictly from the Db Mixolydian scale:
The first chord is Abmin9, otherwise could be written as Bmaj7/G# (for pop musicians.)
The Ab minor scale has all the notes from the melody but
AVOID (absent) Fb
The second chord is Bbmin7(11).
The Bb minor scale has all the notes from the melody but
AVOID(absent) C.
Is that vamping of just two chords - Abmin9 - Bbmin7 an example of Modal composition?
Where is our tonal center - Bb minor?
P.S. I have used the video without visual "attractiveness" in order to focus on Music.