Baa Baa Black Sheep is a nursery rhyme, sung to a variant of the 1761 French melody Ah! vous dirai-je, Maman. The original form of the tune is used for Twinkle Twinkle Little Star and the Alphabet song. The words have changed little in two and a half centuries. It has a Roud Folk Song Index number of 18267.
Baa Baa Black Sheep
Baa, Baa a black Sheep,
Have you any Wool?
Yes merry have I,
Three Bags full,
One for my master,
One for my Dame,
One for the little Boy
That lives down the lane.
source: wikipedia