Then again, you're probably thinking about Bob Marley's song "Three Little Birds," which is an entirely different song with similar lyrics.
Which is, and notably so, Bob Marley's version of the song.
Same thing Eminem does with multiple songs (Dream On and Thank You are the two that come to mind).
Maybe version isn't the best word neither, but you can probably tell what I'm talking about.
Bobby's song:
(whistling)
Here's a little song i wrote,
you might want to sing it note for note,
don't worry, be happy
in every life we have some trouble,
when you worry you make it double
don't worry, be happy
dont worry be happy now
dont worry be happy
dont worry be happy
dont worry be happy
dont worry be happy
aint got no place to lay your head,
somebody came and took your bed,
don't worry, be happy
the landlord say your rent is late,
he may have to litagate,
dont worry (small laugh) be happy,
look at me im happy,
don't worry, be happy
i give you my phone number,
when your worried, call me,
i make you happy
don't worry, be happy
aint got no cash, aint got no style,
aint got no gal to make you smile
but don't worry, be happy
cos when you worry, your face will frown,
and that will bring everybody down,
so don't worry, be happy
don't worry, be happy now...
don't worry, be happy
don't worry, be happy
don't worry, be happy
don't worry, be happy
now there this song i wrote
i hope you you learned it note for note
like good little children
dont worry be happy
listen to what i say
in your life expect some trouble
when you worry you make it double
dont worry be happy
be happy now
dont worry, be happy
dont worry, be happy
dont worry, be happy
dont worry, be happy
dont worry
dont worry be happy
don't worry, don't worry, don't do it,
be happy,put a smile on your face,
don't bring everybody down like this
don't worry, it will soon pass whatever it is,
don't worry, be happy,
i'm not worried
Bob Marley's song:
"Don't worry about a thing,
'Cause every little thing gonna be all right.
Singin': "Don't worry about a thing,
'Cause every little thing gonna be all right!"
Rise up this mornin',
Smiled with the risin' sun,
Three little birds
Pitch by my doorstep
Singin' sweet songs
Of melodies pure and true,
Sayin', ("This is my message to you-ou-ou:")
Singin': "Don't worry 'bout a thing,
'Cause every little thing gonna be all right."
Singin': "Don't worry (don't worry) 'bout a thing,
'Cause every little thing gonna be all right!"
Rise up this mornin',
Smiled with the risin' sun,
Three little birds
Pitch by my doorstep
Singin' sweet songs
Of melodies pure and true,
Sayin', "This is my message to you-ou-ou:"
Singin': "Don't worry about a thing, worry about a thing, oh!
Every little thing gonna be all right. Don't worry!"
Singin': "Don't worry about a thing" - I won't worry!
"'Cause every little thing gonna be all right."
Singin': "Don't worry about a thing,
'Cause every little thing gonna be all right" - I won't worry!
Singin': "Don't worry about a thing,
'Cause every little thing gonna be all right."
Singin': "Don't worry about a thing, oh no!
'Cause every little thing gonna be all right!
Sorry bro, but entirely different songs.