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Thank you all for your suggestions. I found some of these pieces myself before, so I'll be more specific to what I want: I would like to find some easy-to-sing, one to two parts vocal music in mixolydian mode, as I want to use it with my students at the school where I'm teaching music. As they'll sing it, I can't use an 8-part mass (even though it's beautiful). So, maybe gregorian chants are the ones I'm looking for... Thanks again^^