These lyrics by Richard Stallman are set to the tune of the most famous Cuban song, Guantanamera. Before it became tied up with the concentration camp and torture center we've all come to know, Guantanamo was best known for the Cuban patriotic song Guantanamera. Although originally the story of a peasant girl from Guantanamo who broke the narrator's heart, "the Guantanamera became a popular vehicle for romantic, patriotic, humorous, or social commentary lyrics, in Cuba and elsewhere in the Spanish speaking world".
These lyrics to "Guantanamero" are from the point-of-view of a male prisoner
...guantanamera means "of Guantanamo (female)". "Guantanamero" means "of Guantanamo (male).