Musical leaf

[2][3] In South Korea, it is called a chojeok (Hangul:초적) and it is a designated intangible cultural heritage asset.

[4] An instrument of country people, it has been observed being played by herders riding their water buffalo in the rice fields.

Unlike the complex leaf-derived instruments of Australia's closest neighbours in the Indian Ocean littoral and Oceania, the 'gumleaf' is composed of unmodified organic leaf matter.

Through breathing techniques which open the throat, therefore increasing the size of the resonance chamber, one can achieve playing lower notes.

Additionally using thicker leaves makes it is possible to reach lower notes that require far more air to set the leaf in vibration.

An analysis of the overtone series comparing an oboe and birkenblatt (birch leaf) playing the note F2 are nearly identical.