INTRO RIFF
   
e|------------|       e|---4--5--6--|
B|---6--5--4--|       B|------------|
G|---5--4--3--|       G|---5--6--7--| (F[aug]7)
D|------------| x3    D|---6--7--8--|
A|---5--4--3--|       A|------------|
E|------------|       E|------------|
A#maj7(alternating with F bass) 
I'm gonna sit right down and write myself a letter.. 
    Bbmaj7     A#aug7      D7     Eb 
And make believe it came from you.
Cm7                 F7 
I'm gonna write words, oh, so sweet, 
              Dm7             Gm7    
They're gonna knock me off my feet. 
        C             C7         Cm7               F(aug)7 %%%
A lotta kisses on the bottom and I'll be glad I've got 'em.
A#maj7(alternating with F bass)
I'm gonna smile and say, 'I hope you're feelin' better,'
    Bbmaj7     A#aug7      D7       Eb   
and close 'With love' the way   you do...
Eb                 Ebm            Bbmaj7    (Ab7)   G7 
I'm gonna sit right down and write myself a letter, 
    Cm7              F7         Bb     
https://www.coveralia.com/acordes/i-m-gonna-sit-right-down-and-write-myself-a-letter-paul-mccartney.php
and make believe it came from you...
PIANO SOLO  
Repeat all chords up to %%%
A#maj7(alternating with F bass)
I'm gonna smile and say, 'I hope you're feelin' better,'
    Bbmaj7     A#aug7      D7       Eb   
and close 'With love' the way   you do...
Eb                 Ebm            Bbmaj7    (Ab7)   G7 
I'm gonna sit right down and write myself a letter, 
    Cm7         F7              
and make believe... 
    Cm7         F7              
Oh I'm gonna make believe... 
    Cm7         F7                 Bb     
I'm gonna make believe it came from you...
FINAL RIFF
e|------------------|
B|---6--5--4---4-3--|
G|---5--4--3---3-2--|
D|---------------3--|
A|---5--4--3---3-1--|
E|------------------|