Komuso is a zen monk of the Fuke sect (wearing a sedge hood, traveling, and playing a shakuhachi flute as Buddhist’s practice.)
Instead, the stay home Komuso plays a beer bottle. It was really like training for me. I hope that my begging for alms will be rewarded.
The musical piece played by editing the sound of the beer bottle is called Koku (Emptiness). It is a representative piece of shakuhachi played by Komuso.