The tungso (sometimes tongso) is a Korean notched, end-blown vertical bamboo flute used in Korean traditional music. It is similar to the danso, but longer and larger. The instrument is parallel to the Chinese xiao and Japanese shakuhachi. A distinctive feature of the tungso, unlike other vertical flutes is that it may have a buzzing membrane, similar to that of the Korean transverse flute, the daegeum. This is especially common in the folk variety of the instrument. Regarding the instrument's name, tong means "hole" and so refers to the notched end-blown vertical bamboo flute.