What is the "Pioneers O Pioneers" thing in the Levi's commercials?

Search: pioneers

Why: It sounds familiar.

Answer: It's by Walt Whitman omg! "Pioneers! O Pioneers!" is 26 verses long! Here are the parts in the commercial:

COME my tan-faced children,

Follow well in order, get your weapons ready,

Have you your pistols? have you your sharp-edged axes?

Pioneers! O pioneers!

For we cannot tarry here,

We must march my darlings, we must bear the brunt of danger,

We the youthful sinewy races, all the rest on us depend,

Pioneers! O pioneers!

O you youths, Western youths,

So impatient, full of action, full of manly pride and friendship,

Plain I see you Western youths, see you tramping with the foremost,

Pioneers! O pioneers!

All the past we leave behind,

We debouch upon a newer mightier world, varied world,

Fresh and strong the world we seize, world of labor and the march,

Pioneers! O pioneers!

Source: American Poems

The More You Know: The poem was first published in Leaves of Grass in 1855. It is a tribute to Whitman's fervor for the great Westward expansion in the United States that led to things like the California Gold Rush and exploration of the far west. There is another commercial in this ad campaign with the poem "America" (also from Leaves of Grass), read by Whitman himself:

Centre of equal daughters, equal sons,
All, all alike endear'd, grown, ungrown, young or old,
Strong, ample, fair, enduring, capable, rich
Perennial with the Earth, with Freedom, Law and Love,
A grand, sane, towering, seated Mother,
Chair'd in the adamant of Time.