The "tambu" is an instrument, and a form of music and dance found on Aruba, Bonaire (where it is sometimes known as "bari"), and Curaçao. The "tambu" is an especially important symbol of Curaçaoan identity. Instrumentation for the "tambu" uses the "agan", "chapi", triangle, "wiri" and other instruments, many of which are also part of the African-derived "muziek di zumbi", or "spirit music", of Curaçao. Curaçao's folk music also includes a rich tradition of work songs with apentatonic lyrics sung in Guene or a Papiamento variant called "seshi". The Simadan harvest festival is found across the islands, and features the "cachu" trumpet, made from a cowhorn. Bonaire's Simadan festival is also notable for the use of the "becu", an aerophone made from the stalk of a sorghum plant, and the "kinkon", made from a conch shell and known elsewhere as the "carco". Folk song forms range from the harvest "seu", "simadan" and "wapa". Other songs were imported beginning in the 19th century, including the South American "joropo" and "pasillo", Spanish Caribbean "merengue" and other new songs, dances and instruments. This diverse mixture was the origin of the Dutch Antilles' most distinctive and long-standing popular tradition, the "tumba".