Klong song na (Thai: [[wikt:กลองสองหน้า|กลองสองหน้า]], in Thai pronounced as /klɔːŋ sɔ̌ːŋ nâː/ or in Thai pronounced as /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.