From some long-forgotten kids' radio show:

Today is a birthday, I wonder for whom [I love the corect grammar]
I know it's for someone who's right in this room
So look all around you for somebody who,
Is smiling and happy - my godness, it's you

Happy Birthday [and here, fill in the name of the birthday folk]
From all of us to you;
Happy Birthday [same name]
From mommy and daddy too
[At this point, I can't remember the rest of the song]