well this is googles opinion on it!!
"Baa, baa black sheep" Nursery Rhyme History
Educational reasons for the poem "Baa, baa black sheep"poem
The reason to the words and history to this song were to associate wool and wool products with the animal that produces it, not to mention the sound that a sheep would make! The first grasp of language for a child or baby is to imitate the sounds or noises that animals make - onomatopoeia (words sound like their meaning e.g. baa baa in "Baa, baa black sheep"). In some of the earlier versions of "Baa, baa black sheep" the title is actually given as "Ba, ba black sheep" - it is difficult to spell sounds!
The History and Origins of Baa Baa Black Sheep Nursery Rhyme
The wool industry was critical to the country's economy from the Middle Ages until the nineteenth century so it is therefore not surprising that it is celebrated in the Baa Baa Black Sheep Nursery Rhyme. An historical connection for this rhyme has been suggested - a political satire said to refer to the Plantagenet King Richard III (the Master) and the the export tax imposed in Britain in 1275 in which the English Customs Statute authorised the king to collect a tax on all exports of wool in every port in the country. But our further research indicates another possible connection of this Nursery rhyme to English history relating to King Edward II (1307-1327). The best wool in Europe was produced in England but the cloth workers from Flanders, Bruges and Lille were better skilled in the complex finishing trades such as dying and fulling (cleansing, shrinking, and thickening the cloth). King Edward II encouraged Flemmish weavers and cloth dyers to improve the quality of the final English products.
Words and Music
The earliest publication date for the "Baa, baa black sheep" rhyme or poem is dated 1744. Music was first published for "Baa, baa black sheep" was in the early nineteenth century making it into a song for children.