I tabbed it out and found it very hard to sing and play at the same time.
So this is a simplified version.
Feel free to add the original melody in your own interpretation ;)
Am Bm
This sunny Sunday
Am Bm
Is a good day to go
Am Bm
Guess you want me to stay
Am C Bm
Well then let me know
Am
And I hate to say
C Bm
It's been a waste of time
Am C Bm Bm
I hate to interrupt the flow
[Chorus]
Am Am/C Am Am/C Am Am/C Am Am/C <--changes very fast, you'll figure it
Why, Why, out when you listen to the song
Bm G
Why Hushabye
Am Am/C Am Am/C Am Am/C Am Am/C Bm G
Hushabye, why aren't you ready to go?
Am Am/C Am Am/C Am Am/C Am Am/C
Why, Why,
Bm G
Why Hushabye
Am Am/C Am Am/C Am Am/C Am Am/C Bm G
Couldn't we fast forward all through this show?
Am Bm
You say you'd love to
Am Bm
But you've lots left to do
Am C Bm Am C Bm
Almost decided to stay 'cause of you
Am C Bm
And I hate to tell you to exchange your dreams.
Am C Bm Bm
For one more tick of no return
[Chorus]
Am Dsus2 Bm C Bm C
[Why, why
What you hanging up for?
What you doing that for? <--just play these chords until you sang all of this :D
What you beggin' up for?
Why, hushabye]
Am F D G G# 4x
I hate to interrupt the flow
For one more ticking of your time
Am Bm
Soothing Sunday
Am Bm
is a good day to go!
[Chorus]
Am Am/C Am Am/C Am Am/C Am Am/C
Why, Why,
Bm G
Why Hushabye
Am Am/C Am Am/C Am Am/C Am Am/C Bm G
Hushabye, why aren't you ready to go?
Am Am/C Am Am/C Am Am/C Am Am/C
Why, Why,
Bm G
Why Hushabye
Am Am/C Am Am/C Am Am/C Am Am/C Bm G
Couldn't we fast forward all through this show?
Am F D G G# 4x
Hushabye
Why, why, why I
What you breaking up for?
Why, why
Hushabye