From J.W. von Goethe's poem "Der Erlkönig":
"Wilt go, then, dear infant, wilt go with me there?
My daughters shall tend thee with sisterly care
My daughters by night on the dance floor you lead,
They'll cradle and rock thee, and sing thee to sleep."
"My father, my father, and dost thou not see,
How the Alder King is showing his daughters to me?"
"My darling, my darling, I see it aright,
'Tis the aged grey willows deceiving thy sight.