Ok, I'm ready to resume this.
Here's my take on guide tones to this song: (sorry if I'm a pain in the ass with my way of writing)
Chord | Parent Major Scale
F-7: Eb Major
Ab
Bb-7: Ab Major
Ab
Eb7: Ab Major
Bb
AbMaj7: Ab Major:
C
DbMaj7: Db Major
B
G7: C Major
B
Cmaj7: C Major
E
C-7: Bb Major
Eb
F-7: Eb Major
Eb
Bb7: Db Major
F
EbMaj7: Eb Major
G
AbMaj7: Ab Major
G
D7: G Major
A
Gmaj7: G Major
B
A-7: G Major
C
D7: G major
C
Gmaj7: G Major
F#
F#-7: E Major
A
B7: E Major
D
Emaj7: E Major
D#
C+7: C# Major
Eb
F-7: G Major
Eb
Bb7: Db Major
F
EbMaj7: Eb Major
G
AbMaj7: Ab Major
G
DbMaj7: Db Major
Ab
Db-7: B Major
C
C-7: Bb Major
Eb
Bdim7: B Whole-Half Scale
D
Bb-7: Ab Major
D
Eb7: Ab Major
Db
Abmaj7: Ab Major
C