Here is a link to a YouTube video of an Ethiopian folk song:

http://www.youtube.com/watch?v=MjeK4hy5gYM&feature=related
Azmari Sings "Sem ena Worq"
"Ethiopian Azmari Song"

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Here's the entire wikipedia entry about the meaning of the word "azmari":

"An azmari is an Ethiopian singer-musician, comparable to the European bard. Azmari, which may be either male or female, are skilled at singing extemporized verses, accompanying themselves on either a masenqo (one-stringed fiddle) or krar (lyre). Azmari often perform in drinking establishments called tejbeit, which specialize in the serving of tej (honey mead)."
http://en.wikipedia.org/wiki/Azmari

-snip-

"Azmari – from the Aramaic verb, "to sing" – in Ethiopia a wandering entertainer, a minstrel, a voyaging troubadour, one who tells the truth from a different angle, who uses music to convey the collective memory."
http://www.theazmariquartet.com/bio_azmari.html

Note: This is the website of an American chamber music quartet.
I don't think that this quartet plays Ethiopian music-traditional or otherwise.