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Okay, I will tell you the truth. In Greek mythology sirens were not mermaids but actually bird-women. Hence the association with beautiful singing. Their song would lure sailors to their island and keep them there until they starved to death. Or until their ships broke up on the rocks. The most famous sirens are from the Odyssey.
Odysseus, on Circe's advice, had his men put wax in their ears so they could not hear the siren's song. Meanwhile, Odysseus had himself tied to the mast so he could listen to them without being lured from the ship
According to various sources there were two, three or four Sirens. Homer in the Odyssey says there are two. They have different names and histories, again depending on whom you are reading. Homer says the Sirens committed suicide after failing to lure Odysseus and his crew to their deaths. Others say they committed suicide after failing to do the same to one of the Argonauts.