Four lines about a sleepy shepherd boy who has let the sheep and cow wander off. Short enough for the youngest listeners, with a question and answer shape that invites a reply.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
Little Boy Blue, come, blow your horn!
The sheep's in the meadow, the cow's in the corn.
Where's the little boy that looks after the sheep?
Under the haystack, fast asleep!
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition