I like some of the traditional music because it's tonally foreign and very modal. Some modes have a single quarter tone. But it doesn't reach m as it does them.

But the traditional music is only rural now and even here there is a lot of dreary techno. In western-influenced pop they like extremely simple tonality; half the songs sound like The Godfather theme, Aeolian mode (A to a on the white keys)

There were six different traditional modes, three are now extinct. I have a sepia photo of blind musicians who went from village to village performing ... it's dated 1906.

If you were hearing ejoyable singers they were probably Filipino. as are most live performers. Almost all Vietnamese are completely tone deaf.