As agriculturalists, they cultivate a wide variety of crops, including cotton and cash crops for the international market. As musicians, they are world renowned, playing a multitude of instruments from: wind instruments (Aerophones), stringed instruments (Chordaphones) and percussive instruments (Membranophones). Senufo communities use a caste system, each division known as a "katioula". In this system the farmers, known as Fo no, and the artisans at the opposite ends of the spectrum. The term artisan encompasses different individual castes within Senufo society including blacksmiths (Kule), carvers (Kpeene), brasscutters (Tyeli), potterers, and leather workers, whose lives revolve around the roles, responsibilities, and structures inhabited by the individual class. Training to become an artisan takes about seven or eight years; commencing with an apprenticeship where the trainees create objects not associated with the religion of the Senufo, then culminating with an initiation process where they obtain the ability to create ritual object.