Well I have sung Congo River to a mixed race crown and included the verse

What do you think we carried as cargo
Blow, boys, Blow
'twas black sheep breaking the embargo
blow, me bully boys blow.

and it was well received by everyone.

of course the last verse moderates it somewhat.

It's blow today and blow tomorrow
Blow, boys, Blow
It's blow for this hells ship of sorrow
blow, me bully boys blow.