This is one of our all-time favorite Sesame Street clips. Henry's been especially into it lately, asking me to sing the Beautiful Creatures Alphabet instead of the usual song. At the end, he always adds in the little ululation (which I love, because it gives me an excuse to use the word "ululation.")
Ladysmith Black Mambazo always makes me feel all warm and fuzzy inside. When Henry was born my parents bought me a collection of world lullabies to play for him. In that first week, when I nursed all day and night and Henry never seemed to sleep, I listened to it over and over and over. This song was my favorite:

