When song switches from G to Em, he does a walkdown that goes like this.
He does not let the G chord ring out. He only plays bass notes then lets the Em ring

e|---3--3--3--
B|---3--3--3--
G|------------
D|------------
A|------------
E|---3--2--0--

-3-----------|
-3-----------|
-------------|
-2-----------|
-2-----------|
-------------|

Chords:
 xx4320
 022033
  x02230


[Intro]

Oh on the West

bound Bart, do

ve under water

 and
           
my ears popped

             
 and, your eye

  
s watered
           
and mascara ra

              
n down your fa

 
ce

[Verse 1]

And you looked

 at me from th

ree rows away
           
As if to say, 

             
please stop st

            
aring at me an

         
d so I did


And you got of

f at 16th and 

Mission and
          
I did too, I d

              
idn't want it 

              
to seem like I

     
 was following

 you
             
It was the sam

             
e stop I was g

             
etting off, I 

    
swear


And you walked

 on down the s

treet, and I w

alked behind
             
But you kept o

             
n making the s

            
ame turns, I w

           
as gonna make
             
Till finally y

            
ou stepped in,

             
 the same bar 

            
that I was goi

    
ng to


And it was tue

sday night kar

aoke
             
And I sang Lay

           
, Lady, Lay, w

              
ith the funny 

           
voice and all
             
And you sang B

             
ohemian Rhapso

            
dy, and everyb

           
ody sang along
             
Especially on 

           
that part, Tha

              
t says I somet

            
imes wish I'd 

              
never been bor

      
n at all

[Harmonica]
       

[Verse 2]

And when you w

ere done, and 

the crowd arou

nd you dispers

ed
             
I went up to t

           
ell you, just 

              
what a great j

           
ob you had don

e


You said I won

der if when Fr

eddie Mercury
             
Wrote Bohemian

           
 Rhapsody, if 

              
he knew it was

          
 going to be
             
The ultimate s

           
ong for karaok

e

[Bridge]
            
And I said "wh

          
at about Ameri

can Pie?"
             
And you said "

#     
fuck American 

Pie"
           
Our generation

            
 can not ident

           
ify with drove

              
 my chevy to t

     
he levee
            
It ain't nothi

             
ng when compar

            
ed to I someti

              
mes wish I'd n

              
ever been born

      
 at all

[Harmonica]
       

[Verse 3]

You said well 

that was a gre

at version of 

Lay, Lady, Lay
             
With the funny

            
 voice and all

             
, Back from Bo

              
b Dylan's Nash

            
ville Skyline 

              
days if I do r

   
ecall


I said yeah I 

don't normally

 do this karao

ke thing
             
But if I do, I

              
 either sing t

           
hat song or ev

              
erybody must g

      
et stoned
             
Rainy Day Wome

              
n number twelv

            
e and thirty-f

              
ive(technicall

   
y that's what 

that songs cal

led)


And you said y

eah what's wit

h that song ti

tle, whats wit

h the 12 and 3

5
             
I said well 12

           
 times 35 is f

              
our hundred an

            
d twenty, and 

              
you know what 

             
they say about

          
 four twenty
              
But maybe that

             
's just the ma

              
th major in me

     
 talking
             
I dont know wh

            
at it means, I

          
t just does


But girl you k

now I used to 

roam around
             
Play my own gu

           
itar, Sing my 

      
own songs
             
It's been a wh

            
ile since I've

              
 been on the r

  
oad


See I've lost 

my muse, and I

 have not writ

ten a song
             
In about a yea

           
r or so, Im ta

              
king a little 

  
break
             
My friends cal

            
l it retiremen

             
t I don't know


But just today

, the most ama

zing thing hap

pened
             
I saw somethin

            
g beautiful an

            
d I felt a spa


rk
             
Of a brand new

           
 song, That I 

            
have not felt 

         
in so long

[Bridge]
            
And you said S

             
ing it to me, 

            
I said it's no

            
t ready to sin

g
            
Because all I 

           
have is the ve

           
ry first line
            
She said if yo

              
u don't sing m

             
e that first l

              
ine now, there

            
 will never be

     
 a second line
            
Give me what y

              
ou got boy or 

       
else go home

I said okay, here goes


[Chorus]

Oh on the West

bound Bart, do

ve under water

 and
           
my ears popped

             
 and, your eye

  
s watered
           
and mascara ra

              
n down your fa

 
ce