Kosi

A grammar sketch of Kosi is available here and a lexicon here. Below is a translation of the "elvish rhyme of lore" about the Rings of Power.

Three Rings for the Elven-kings under the sky,	Rihu bülatu mara edlis kotsülemdroha,	Three rings owned by the happy forest people kings under the sky,
Seven for the Dwarf-lords in their halls of stone,	Su bülatu harühau lanau mara rihkulemdroha,	Seven rings owned by the stone halls-dwelling short gold man kings,
Nine for Mortal Men doomed to die,	Kru bülatu bohadvasak om,	Nine rings owned by the death-fated humans,
One for the Dark Lord on his dark throne	Üsu bulatu saudab drohülab sauddroha	One ring owned by the Evil King on his dark throne
In the Land of Mordor where the Shadows lie.	Vaibsojau hasakau Bulatmotjokau.	In the shadow-dwelling Ring-Destruction-Place.
One Ring to rule them all, One Ring to find them,	Üs bulat, maremab ukra, öt maremt srih,	One ring, it will rule everyone, it will find everyone,
One Ring to bring them all and in the darkness bind them	Öt maremt deh, öt maremt örau endar	It will unify everyone, it will bind them at night
In the Land of Mordor where the Shadows lie.	Vaibsojau hasakau Bulatmotjokau.	In the shadow-dwelling Ring-Destruction-Place.