I nominate "Uncle Joe's Hail Columbia" (it's in the DT) for the honor of commemorating any and all emancipations of slaves, whatever the date.

(Ignore the minstrel-stage dialect)

UNCLE JOE'S "HAIL COLUMBIA"
(Henry Clay Work)

Uncle Joe come home a singing, Hail Columby!
Glorious times de Lord is bringing, Now let me die.
Fling de chains into de ribber, Lay de burden by;
Dar is one who will delibber, Now let me die.

cho:

Ring de bells in eb'ry steeple!
Raise de Flag on high!
De Lord has come to sabe His people,
Now let me die.

Bressed days, I lib to see them, Hail Columby!
I hab drawn a breff of freedom, Now let me die.
Ninety years I bore de burden, Den He heard my cry
Standin' on de banks ob Jordan; Now let me die.

cho

Dis is what de war was brought for. Hail, Columby!
Dis is what our faders fought for. Now let me die,
Dar's an end to all dis sorrow, Comin' by and by,
Prayin for dat bressed tomorrow -- Now let me die.

cho

I hab seen de rebels beaten, Hail Columby!
I hab sen de hosts retreatin' -- Now let me die.
O! dis Union can't be broken Dar's no use to try,
No sech ting de Lord has spoken -- Now let me die.

cho

I'll go home a-singing "Glory!" Hail Columby!
Since I heard dis bressed story -- Now let me die.
'Tis de ransom ob de nation Drawin' now so nigh
'Tis de day ob full salbation! Now let me die.

cho

Published in 1865, probably in response to the end of the war and/or the 13th amendment, if not both. I love this song, though I don't do it in full minstrel dialect.

Bob