Beku is a flute made from corn wood, (sorghum). After the corn harvest, the thickest and most sturdy stalks were chosen to make beku. The making and playing of bekus has practically disappeared.
This instrument came from Africa and it was still played until the 1970s. According to musicologist Jos Ganseman in his book "Folk Instruments, Witnesses and Results of an Interethnic Society," informants have indicated that during the harvest festival, the simadan, the bek'u was played along with the bar'i, kachu, bamba, guitar and kuarta, or along with the triangle and rasp.