ceremonies. Early television dramas in this era utilized folklore and songs from popular indigenous genres such as Nigerian highlife, as well as indigenous languages including Igbo, Yoruba, and so on. With the advent of Nigeria's film industry, controversially referred to as Nollywood, in the early 1990s, many of these TV producers simultaneously worked in film production, spreading this technique of indigenous sourcing to film scoring. Following an era defined by influences from European and North American art, the Nigerian film industry evolved a unique method of film scoring called prefiguring. Prefiguring, popularized by the famous Nigerian soundtrack producer Stanley Okorie, utilizes motifs and repetitive tunes to foreshadow dialogue and major plot events before they happen on screen. This novel film scoring technique unique to the Nigerian film industry draws upon the art of storytelling in indigenous communities of Nigeria, displaying qualities of the communities’ languages, songs, dances, and dramas. Children's music Children in Nigeria have many of their own traditions, usually singing games. These are most often call-and-response type songs, using archaic language. There are other songs, such as among the Tarok people that are sexually explicit and obscene, and are only performed far away from the home. Children also use instruments such as un-pitched raft zithers (made from cornstalks) and drums made from tin cans, a pipe made from a pawpaw stem and a jaw harp made from a sorghum stalk. Among the Hausa, children play a unique instrument in which they beat rhythms on the inflated stomach of a live, irritated pufferfish. Traditional instruments Although percussion instruments are omnipresent, Nigeria's traditional music uses a number of diverse instruments. Many, such as the xylophone, are an integral part of music across West Africa, while others are imports from the Muslims of the Maghreb, or from Southern or East Africa; other instruments have arrived from Europe or the Americas. Brass instruments and woodwinds were early imports that played a vital role in the development of Nigerian music, while the later importation of electric guitars spurred the popularisation of jùjú music. Percussion The xylophone is a tuned idiophone, common throughout west and central Africa. In Nigeria, they are most common in the southern part of the country, and are of the central African model. Several people sometimes simultaneously play a single xylophone. The instruments are usually made of loose wood placed across banana logs. Pit- and box-resonated xylophones are also found.