"Kaval Sviri" (The Flute Plays) 

Try the interactive tutorial, or download the Sheet music here: musescore.com/...
Kaval Sviri is a traditional Bulgarian folk song. These tunes would be sung by women working in the fields in groups. I felt compelled to arrange this song for a small saxophone choir after listening to it initially because of how different it is from western music. What we would call dissonance in our western way of thinking about music, is tense harmony for the ones singing it.