Then there's this quote from Frederick Douglass:
the heart has no language like song
Poetry is song without music.
Or rather, the music is inherent in the words.
Obviously, the article is dealing with a far different flavor of slavery than mine. For one thing, the songs deal, often only slightly covertly, with either escape (among American slaves) or rebellion (the Russian serfs). There's an interesting explanation for the difference. I, of course, have no interest in escape, and outright rebellion would trigger the end of the relationship.
But my errant imagination can't help but think that the world - our world, at least - could use some songs for slaves such as we. Songs to sing as we work, sings "to regulate the movement" of our mouths and our hands as we strive to please the ones who own us.
Songs to be sung with a cock in one's mouth.