I just checked this out. The explanation given on the commentary is that the actress created the chant herself, mixing bits of Czech (her native language) with bits of an Arabic nursery rhyme she remembered from when she was a child. No mention of it being a love song, though.BarbarianKing said:Someone in comments section of the YouTube scene said that if you watch the movie with the director's and actor's comments, they give the answer there as to why they used this song.