Klong song na (Thai: กลองสองหน้า, pronounced [klɔːŋ sɔ̌ːŋ nâː] or [klɔːŋ sɔ̌ŋ nâː]) is a Thai barrel drum. Song na means "two faces", and the drum has two heads that are played with the hands. It is used primarily in the piphat ensemble.
