 Six national holidays are observed throughout the year, and movable holidays include the Christian holiday of Easter Monday and the Muslim holidays of Eid ul-Fitr, Eid ul-Adha, and Eid Milad Nnabi.The music of Chad includes a number of instruments such as the "kinde", a type of bow harp; the "kakaki", a long tin horn; and the "hu hu", a stringed instrument that uses calabashes as loudspeakers.Other instruments and their combinations are more linked to specific ethnic groups