§ Of the Coming of Men into the West The Silmarillion

In a valley among the foothills of the mountains, below the springs of Thalos, he saw lights in the evening, and far off he heard the sound of song. At this he wondered much, for the Green-elves of that land lit no fires, nor did they sing by night At first he feared that a raid of Orcs had passed the leaguer of the North, but as he drew near he perceived that it was not so; for the singers used a tongue that he had not heard before, neither that of Dwarves nor of Orcs. Then Felagund, standing silent hi the night-shadow of the trees, looked down into the camp, and there he beheld a strange people.