That's a good one bubblyrat!

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Here's an excerpt from http://en.wikipedia.org/wiki/Guantanamera

"The song used as social "newspaper"
Given the song's musical structure, which fits A-B-A-B (sometimes A-B-B-A) octosyllabic verses, the Guantanamera lent itself from the beginning to impromptu verses, improvised on the spot, similar to what happens with the Mexican folk classic, "La Bamba". Fernández's first use of the song was precisely this; he would comment on daily events on his radio program by adapting them to the song's melody, and then using the song as a show closer. Through this use, the Guantanamera became a popular vehicle for romantic, patriotic, humorous, or social commentary lyrics, in Cuba and elsewhere in the Spanish speaking world.

Adaptation from the "Versos Sencillos" by José Martí
The better known "official" lyrics are based on the first verse of the first poem of the collection "Versos Sencillos" (Simple Verses) by Cuban nationalist poet and independence hero José Martí, as adapted by Julián Orbón. Word has it that Orbón considered Martí's poems as fitting, and thus dignifying, to such a popular song. Given Martí's significance to the Cuban people, the use of his poem in the song virtually elevated it to unofficial anthem status in the country.

Ambiguity in the song
In the original lyrics, the author referred to a "guajira guantanamera" (a peasant girl from Guantánamo), but since the song itself is structured as a guajira (the Cuban rhythm, named after Cuban peasants), some people (erroneously) think that the chorus refers to the song itself (or, rather, its rhythmic structure), and not to an individual. In other words, the words are interpreted as an introduction to a "guajira, Guantánamo-style". This has essentially guaranteed that the chorus' lyrics still be used to this day, as evidenced by their use along with the (seemingly) unrelated Martí verses"...