This tab is tuned half step down. Cmaj9/B refers to the chord x20010, the walk down chord between C and Am.
I recommend playing the interlude and chorus with barre shapes and not open chords.
It's nice to have a new Brand New song, even if it is an old demo. Here is a YT link to the song:
https://www.youtube.com/watch?v=wYDHWl8y320

[Intro]

eb|-----------
Bb|-----------
Gb|----------7
Db|-----------
Ab|------5h7--
Eb|-5h8p5-----

--------------
--------------
-9-7h9-7-7-7h9
--------------
--------------
--------------

--------------
--------------
-7h9-7-7h9-7-9
--------------
--------------
--------------

--------------
--------------
/12-9---------
--------------
--------------
---------5h8p5

-----|
-----|
-----|
-----|
5h7--|
-----|



[Verse 1]

I wish I was a

 simple man
             
Always quiet, 

              
always had to 

     
make plans
      
On my own

Tried to be ho

nest to unders

tand

I'm often jeal

ous
              
It's not as si

            
mple as then
              
Back in my own

 
 home

[Chorus 1]
             
Quietly going 


crazy
             
Bored, tired a

           
nd lazy and bl


ue

[Interlude 1]
     

[Verse 2]

I wish I was a

 simple man
             
Trying hard I'

              
€™m doing the 

          
best that I ca

n
      
On my own

If I had a sec

ond chance

I'd go back
              
And mend all t

              
he things that

   
 I could have
        
Back at home

[Chorus 2]
             
Quietly going 


crazy
             
Bored, tired a

           
nd lazy and bl


ue
             
I'€™m growing 

           
old and less s

pry
             
This time arou

             
nd I won't sav

      
e me, or you

[Interlude 2]
    

   

[Chorus 3]
             
Quietly going 


crazy
             
Bored, tired a

           
nd lazy and bl


ue
             
I'm growing ol

           
d and less spr

y
             
This time arou

             
nd I won't sav

      
e me, or you

[Outro 1]
     
Am G x 4