The sáo (also called sáo trúc or "sow trook", pronounced [ʂǎːw ʈʂǔkp]) is a family of flutes found in Vietnam that is traditionally thought to contain the culture and spirit of Vietnam's countryside. The most common variety is played with the flutist holding the sáo transversely to the right side with his or her mouth placed at the blowing hole. Other varieties include the Sáo Dọc, a kind of recorder similar to the Thai Khlui, the Sáo Bầu, and the Sáo ôi, a recorder played by the Muong people. The sáo is usually performed solo or in an ensemble among other instruments in orchestras of Vietnamese popular opera Chèo, Van singing genre, and Royal Small Orchestra.