Liberia and "Rivers of Babylon": What's the connection?

I just realized that I never took the simple step of plugging "Samuel Doe" and "Rivers of Babylon" into Google. But it turns up only a review of Denis Johnson's book "Reports from The Edges of America and Beyond" comes up, in which the reviewer describes a scene where Johnson meets the Liberian warlord who killed Doe, Prince Johnson (no relation, obv), a month after Doe's death, singing the Melodians song to his thugs:

"Driven through town to the former compound of a mining company, 'the journalists' find the military leader Prince Johnson in the middle of his morning concert, 'gripping an acoustic guitar and singing "Rivers of Babylon," a Creole-reggae version of Psalm 137' to his troops. In an interview, they ask him about the death of Samuel K. Doe, the president, a month before. Prince Johnson insists that Doe died of wounds received during his capture, but then reveals matter-of-factly, 'I cut off his ears and made him eat them.'"

Here's the link:

http://www.tedconover.com/seek.html