The poems listed here are from various writings of Tolkien.  Although the majority can be found in The Hobbit or LotR, some come from The Tolkien Reader.  Of course, I do plan on adding more in the future.   Note that not all the poems in Tolkien's writings have names.  I have given names to those that were without so as to make a distinction of it.

Entsong

Ent:
When Spring unfoldsthe beechen leaf, and sap is in the bough;
When light is on the wild-wood stream, and wind is on the brow;
When stride is long, and breath is deep, and keen the mountain-air,
Come back to me! Come back to me, and say my land is fair!

Entwife:
When Spring is come to garth and field, and corn is in the blade;
When blossom like a shining snow is on the orchard laid;
When shower and Sun upon the Earth with fragance fill the air,
I'll linger here, and will not come, because my land is fair.

Ent:
When Summer lies upon the world, and in a noon of gold
Beneath the roof of sleeping leaves the dreams of trees unfold;
When woodland halls are green and cool, annd wind is in the West,
Come back to me! Come back to me, and say my land is best!

Entwife:
When Summer warms the hanging fruit and burns the berry brown;
When straw is gold, and ear is white, and harvest comes to town;
When honey spills, and apple swells, though wind be in the West,
I'll linger here beneath the Sun, because my land is best!

Ent:
When Winter comes, the winter wild that hill and wood shall slay;
When trees shall fall and starless nights devour the sunless day;
When wind ios in the deadly East, then in the bitter rain
I'll look for thee, and call to thee; I'll come to thee again!

Entwife:
When Winter comes, and singing ends; when darkness falls at last;
When broken is the barren bough, and light and labour past;
I'll look for thee, adn wait for thee, until we meet again:
Together we will take the road beneath the bitter rain!

Both:
Together we will take the road that leads into the West,
And far away wil find a land where both our hearts may rest.