Answer:
The song Loi Krathong was originally composed in the 1930s by Euah Suntornsanan (1910 – 1981). ... We performed Loy Kratong together with music improvised on the pi (double reed oboe), kong (or gong), ranad (xylophone), ching and chab (different small cymbals) as well as various types of glong (or drums).
