The koto is Japan's national instrument, a long thirteen-string zither introduced from China over a thousand years ago and refined in imperial court music. Its plucked, harp-like tone became closely linked with traditional Japanese culture, tea ceremonies, and seasonal festivals. Online, short koto clips are widely shared as an instant audio cue for Japan, used in travel edits, anime-inspired videos, cooking content, and calm background loops where creators want an elegant, recognisable sound without lyrics or a full orchestral arrangement.