Tolkien was a philologist and the languages of the various races of his universe were the first to be written. This is Namárië (Galadriel's Lament) by J. Tolkien, written in the High Elvish language, Quenya.
One pinner says "I feel that Tolkien’s works have power and spirit that no other writer has since managed to achieve. Middle-earth is a place with no equal, and I don’t think anyone can ever do again what Tolkien did." I must agree!