Here's "I Don't Worry About a Thing" by Mose Allison, possibly the most under appreciated singer/songwriter in the history of mankind.

I DON'T WORRY ABOUT A THING - Mose Allison

If this life is drivin you to drink
You sit there wondering just what to think
I've got some consolation, I'll give to you if I might
I don't worry bout a thing
Cause I know nothing's going to turn out right

You know this world is one big trouble spot
Caues some have plenty and some have not
I used to be trouble till I finally saw the light
I don't worry bout a thing
Cause I know nothing's going to turn out right

Don't waste your time tryin to be a go-getter
Thing's will get worse before they get better
There's always somebody playing with dynamite
I don't worry bout a thing
Cause I know nothing's going to turn out right