sawai is composing a contemporary piece for koto, a traditional instrument, but he continues the tradition of writing with some expression of nature and somewhat of a narrative. [conga drumming] (narrator) one of the most common vocal and instrumental forms found around the world is call and response. call and response is both a structure and a way of performing. it relies on the regular alternation between soloist and chorus. in sub-sahara africa, it is one of the main ways that vocal music is organized. [call and response singing] (man) call and response is the lifeblood of african people. and so, for example, when we played "kakilambe," there was a call, ♪ maimbo maimbo mama maimbo kakilambe be boom be ♪ and we responded. and so, as you could see, there is a lead person singing, and we respond directly. so if you had to connect it to, perhaps, a western sense of it, you would have section a stated and then section a repeated. in the ceremony for kakilambe, call and response plays a very important part within the music. it's a harvesting dance. you're calling to kakilambe for blessings.