The verse that appears in the soundtrack is an Elvish translation of the moment when Beren and Lúthien Tinúviel first embrace. In English:
“Tinúviel the elven-fair, Immortal maiden elven-wise, About him cast her shadowy hair And arms like silver shimmering.“
But this isn’t the only time the Song of Beren and Lúthien shows up in the soundtrack.
When we first see Arwen, we hear in the soundtrack a beautiful female solo singing the words “Tinúviel elvanui, elleth alfirin” or “Tinúviel the elven fair, immortal maiden..” comparing Arwen to
Lúthien. That line is also a fragment from the same verse of The Lay of Leithian we heard Aragorn sing earlier (it’s like the poor lovestruck dweeb had Arwen’s theme song stuck in his head…)