of the North are known for complex percussion instrument music, the one-stringed goje, and a strong praise song vocal tradition. Under Muslim influence since the 14th century, Hausa music uses free-rhythmic improvisation and the Pentatonic scale, similar to other Muslim Sahelian tribes throughout West Africa, such as the Bambara, Kanuri, Fulani and Songhai. Traditional Hausa music is used to celebrate births, marriages, circumcisions, and other important life events. Hausa ceremonial music is well known in the area and is dominated by families of praise singers. The Hausa play percussion instruments such as the tambora drum and the talking drum. The most impressive of the Hausa state instruments, however, is the elongated state trumpet called Kakaki, which was originally used by the Songhai cavalry and was taken by the rising Hausa states as a symbol of military power. Kakaki trumpets can be more than two metres long, and can be easily broken down into three portable parts for easy transportation. Igbo The Igbo people live in the south-east of Nigeria, and play a wide variety of folk instruments. They are known for their ready adoption of foreign styles, and were an important part of Nigerian highlife. The most widespread instrument is the 13-stringed zither, called an obo. The Igbo also play slit drums, xylophones, flutes, lyres, udus and lutes, and more recently, imported European brass instruments. Courtly music is played among the more traditional Igbo, maintaining their royal traditions. The ufie (slit drum) is used to wake the chief and communicate meal times and other important information to him. Bell and drum ensembles are used to announce when the chief departs and returns to his village. Meal times may include pie, and other dessert foods for the holidays. Yoruba The Yoruba have a drumming tradition, with a characteristic use of the dundun hourglass tension drums. Ensembles using the dundun play a type of music that is also called dundun. These ensembles consist of various sizes of tension drums, along with kettledrums (gudugudu). The leader of a dundun ensemble is the iyalu, who uses the drum to "talk" by imitating the tonality of Yoruba Much of Yoruba music is spiritual in nature, and is devoted to their God. Yoruba music has become the most important component of modern Nigerian popular music, as a result of its early influence from European, Islamic and Brazilian forms. These influences stemmed from the importation of brass