Dylan plays it differently constantly throughout the song. I just used the patter from the harmonica solo
C E Am
Perhaps it's the color of the sun cut flat I'm coverin'
D/F#
The crossroads I'm standing at
C/G G Am
Or maybe it's the weather or something like that
F C/G G C G
But mama you been on my mind
C E Am
I don't mean trouble please don't put me down or get upset I am not pleading
D/F#
Or saying I can't forget you
C/G G Am
I do not pace the floor bow down and bent but yet
F C/G G C G
But mama you been on my mind
C
Even though my eyes are hazy and my thoughts they might be narrow where you
E Am
been don't bother me
D/F#
Or bring me down with sorrow
C/G G Am
I don't even mind who you'll be waking with tomorrow
F C/G G C G
But mama your just on my mind
C E Am
I'm not asking you to say words like yes or no please understand me
D/F#
I have no place I'm calling you to go
C/G G Am
I'm just whisperin' to myself so I can't pretend that I don't know
F C/G G C G
Mama you are on my mind
Harmonica Solo
C
When you wake up in the morning baby look inside your mirror you
E Am
know I won't be next to you
D/F#
You know I won't be near
C/G G Am
I'd just be curious to know if you can see yourself as clear
F C/G G C
As someone who has had you on his mind