bunkafu; tablature notation for shamisen
A traditional Japanese tablature system specifically for shamisen music, using numbers and symbols to indicate finger positions and techniques.
Bunkafu is widely used as sheet music for the shamisen.
This piece is written in bunkafu, so it's easy to read for shamisen players.
文化 (Bunka, a historical era name) + 譜 (musical notation). The system was developed during the Bunka era (1804–1818), hence the name.