I believe this is Hubby's favorite childhood song ... because his last name starts with "W". He has been singing it to Maggie almost since the moment she arrived (or at least once we started recovering from newborn sleep deprivation). He was tickled pink when she finally started imitating the sounds:
(video courtesy of Grandma Webb)
The W Song
Oh what is the letter we love?
What sound are we extra fond of?
It's not any trouble, you know it's a W
When you hear "wu-wu-wu-wu"
That's Grandma you hear, by the way. I'm sure she'll be delighted about her national singing debut :)