The subject of this article originates from non-canonical sources. To find out about what is considered "canon" see LOTR:Canon.
Lament for Haldir is the name of the minute-long section of the soundtrack of Peter Jackson's The Lord of the Rings: The Two Towers for when Haldir is slain during the Battle of the Hornburg. The solo lyrics (words in the Quenya tongue) were sung by Elizabeth Fraser, whose voice is also in the Lament for Gandalf.
Ar sindarnóriello caita mornië,
Ar ilyë tier unduláve lumbulë...
English translation Edit
Out of a grey country darkness lies
And all paths are drowned deep in shadow...