 There, the naturalist and the singer discuss about the nature of music.They first talk about the importance of music and singing in the nature, with Attenborough explaining how music works for birds like the bird-of-paradise and the lyrebird, whose chirping is defined by the naturalist the "most complex sound ever", and he goes on by stating that the bird has developed an "impressive vocal range" which he compares to that of Björk.Attenborough states that the human larynx is capable of many more sounds that preceded language.