"Loek Sura," by Sombat Methani and Rut Ronphop, from Wiwa Pha Fan (O.S.T.).

This soundtrack was produced back in 1971 when the cha cha cha had made its way to Thailand and was quickly being adapted for traditional Thai instrumentation.

By 1971, many records had been cut in the style, and it was only a matter of time before this new fusion music would make it to film.

There are some other great tracks from the soundtrack, but this one has these out-of-place pick slides that are kinda surreal and priceless. Couldn't resist pointing it out.