From
William Wilberforce

Wilberforce's Abolition Speech - 15 Songs of Lamentation

As to their singing, what shall we say when we are told that their songs are songs of lamentation upon their departure which, while they sing, are always in tears, insomuch that one captain (more humane as I should conceive him, therefore, than the rest) threatened one of the women with a flogging, because the mournfulness of her song was too painful for his feelings. In order, however, not to trust too much to any sort of description, I will call the attention of the House to one species of evidence which is absolutely infallible.

(Voice of William Wilberforce provided by Chris Cade)