Possibly no one if anyone possibily the gods (if any then Posieden) but since the Sirens are there to draw humans to their island then they must know about everybody and how to draw all in and since Homer doesnt describe any of the other songs that the Sirens would try (or tried) to sing to the rest of his crew then they knew that Odyesseus was the only one that could hear them and so if they knew that then they could know that he and whoever else is coming what they wanted to hear
Circe told him about the Siren and Scylla and Chrybdis
He wanted to hear the sirens so he told his men to tie him to his ship's mast and to put beeswax in their ears. So, Odysseus heard the sirens but could not be drawn to them as he was tied down.
He told them to put wax in their ears, so they wouldnt hear the sirens.
He told his men about the sirens, sharing what Circe had told him. gave them beeswax to plug their ears from their song.So that he could hear their enchanting, tempting song, Odysseus instructed his men to tie him to the mast, and only lash him tighter no matter what he says until they are past the sirens.
Yes, Odysseus and his crew were tempted by the Sirens' enchanting song as they passed by. In order to resist their allure, Odysseus had his men plug their ears with beeswax and had himself tied to the ship's mast to avoid succumbing to the Sirens' song.
Because Odysseus has to complete what Circe's has told him to do. It was a test to see is Odysseus had the courage and strength to listen to the Sirens. This would strengthen or weaken his leadership skills to the reader. And of course it strengthened his leadership skills.
No one did- Penelope ran a series of tests to identify Odysseus.
Yes; the Sirens sang their enchanted song, and attempted to lure Odysseus and his men to their doom.
They Sing
He was warned about the Sirens by one of the spirits he met in the underworld.
he made his crew put wax earplugs in their ears. he himself wanted to hear the sirens beautiful music, so he asked his crew to tie him to the mast, the foundation of a sail. Odysseus's crew ties Odysseus very tightly to the mast, and disarmed him. When the were going past the sirens, Odysseus was screaming and yelling at his crew to let him go to the sirens. The crew obviously did not hear him because they had the wax ear plugs. That is how Odysseus saved his crew from the sirens.
The sirens are a danger that Odysseus and his men must pass to return home.