Yes, we can clearly see it's a love-hate relationship for some.
Only so much can be notated in printed music. To grasp this music you really need to study with someone who really understands it . . .like the composer or that first young man.
Here is a free PDF of the score:
http://dangngoclong.com/download-Dateien/Score/Morning-Mai.PDF
Here is the composer, Dang Ngoc Long, playing his Morning-Mai
http://www.youtube.com/watch?v=FWEpQUXE57M
Here is Long's arrangement of the Vietnamese folk song "Beo Dat May Troi"
http://www.youtube.com/watch?v=1AGWbPkkruY
This famous old folk song's title roughly translates as "Drifting Towards Clouds"
Here is that same folk song sung in Vietnames:
http://www.youtube.com/watch?v=nUK-I4tcNnI
Here it is played with native insturments:
http://www.youtube.com/watch?v=EeaFYfrofrM
If you grow up hearing this kind of music, the bending and blending to tones it's natural to your ear. If you have the skill, whatever you can hear in your mind you can reproduce on the guitar to some extent. It's just as difficult for them to "catch" the essence and flavor of our delta blues as it is for us to "catch" their essence.
Well, unless of course you deeply focus on listening and "catching" it for yourself with help.
Btw, I watched the movie trailer for "In The Wind." Let me know when I can find the full movie.
I went to the Vietnamese market this morning early. It's a big market and they always play those old folk songs.