Question: who are the sirens in brother where art thou

title: O Brother, Where Art Thou?
text: Near a river , the group hears singing . They see three women washing clothes and singing . The women drug them with corn whiskey and they lose consciousness . Upon waking , Delmar finds Pete 's clothes lying next to him , empty except for a toad . Delmar is convinced the women were Sirens and transformed Pete into the toad . Later , one - eyed Bible salesman Big Dan Teague invites them for a picnic lunch , then mugs them and kills the toad . 

Answer: answer: Delmar is convinced that the three women washing clothes and singing were Sirens.
answer: Delmar is convinced that the three women who drugged him and the group with corn whiskey were Sirens.