[Salix]

One of my favorites is definetely

We come, we come with roll of drum: ta-runda runda runda run!
We come, we come with horn and drum; ta-runa runa runa rom!

To Isengard! Though Isengard be ringed and barred with doors of stone;
Though Isengard be strong and hard, as cold as stone and bare as bone,
We go, we go, we go to war, to hew the stone and break the door;
For bole and bough are burning now, the furnace roars — we go to war!
To land of gloom with tramp of doom, with rool of drum, we come, we come;
To Isengard with doom we come!
With doom we come, with doom we come!

and of course

Baruk Khazud! Khazud Ai-menu!

and

Arise, arise, Riders of Theoden!
Fell deeds awake; fire and slaughter!
spear shall be shaken, shield be splintered,
a sword-day, a red day, ere the sun rises!
Ride now, ride now! Ride to Gondor!