‘Oh! Susanna’
This song, written by Stephen Foster, was sung in minstrel shows, and the original lyrics were hugely offensive. The piece was based on an African-American, who is portrayed as blustering, but ignorant, heading south from Alabama to see his girl in Louisiana.
Some of the lyrics of the song go as such:
I jumped aboard the telegraph,
And trabbled down the riber,
De lectric fluid magnified,
And killed five hundred n*gger