The most popular here is NOCHE DE PAZ, which origin is possibly Spanish, and is pretty good for soloist, and also many beautiful choral arrangements were made. Let me try some sources on the net, otherwise I'll make a MIDI file. In Venezuela the Christmas songs are called GAITAS and come from the state of Zulia, in the venezuelan West, they would make a wonderful surprise, but Alas! I don't have any CD. Again, I'll try in the net, and come back tomorrow.
Un abrazo - see you in the Cantina - Andrés