This song is good for illustrating the use of shortened forms in informal English.
Sun is shinin' (shining) in the sky
There ain't (isn't a) a cloud in sight
It's stopped rainin' (raining) ev'rybody's (everybody is) in a play
And don't you know
It's a beautiful new day hey, hey
Runnin' (running) down the avenue
See how the sun shines brightly in the city
On the streets where once was pity
Mister blue sky is living here today hey, hey
Mister blue sky please tell us why
You had to hide away for so long.
Where did we go wrong?
Hey you with the pretty face
Welcome to the human race.
A celebration, mister blue sky's up there waitin' (waiting)
And today is the day we've waited for!
Hey there mister blue
We're so pleased to be with you
Look around see what you do
Ev'rybody smiles at you.
Mister blue sky, mister blue sky
Mister blue sky.
Mister blue, you did it right,
But soon comes mister night creepin' (creeping) over
Now his hand is on your shoulder
Never mind I'll remember you this
I'll remember you this way.
Mister blue sky please tell us why
You had to hide away for so long.
Where did we go wrong?
Hey there mister blue
We're so pleased to be with you
Look around see what you do
Ev'rybody smiles at you.
Ba ba ba ba ba ba ba ba ba
Ba ba ba ba ba ba ba ba ba ba ba