Looking for a song


You know, in the movie the Lord of the Rings, I'm not sure whether it's in the 2nd or 3rd but there's this scene where the king of somewhere sent his son to a battle which everyone knew was a suicide mission.

As his son rode to his death, the king ate heartily, and Merri sat by his side. The king asked Merri to sing a song for his entertainment, and Merri did.

It was very sad and heart wrenching, to see the usual playful Merri to sit so sober and sad, singing his heart out.

Now comes the question: What is that song that Merri is singing? Does anyone have the title of that song?