Humans belong to a group called anthropoids. Gibbons have the most human-like traits among the anthropoids. Gibbons are the only apes capable to sing like humans and communicate through their songs. This film documents an unprecedented attempt to investigate the musicality of multiple species of wild gibbons - siamang, the white-handed gibbon and the javan gibbon - surviving in the South-East Asians habitats. The story of endangered Asian Ape unfolds in this documentary with their songs in various situations.

Is there a connection between animal sounds and the music that humans create? Using a surprising and wide variety of evidence from the animal kingdom -- including the humpback whale, the lyre bird, the siamang gibbon and the great reed warbler -- Sir David Attenborough seeks to prove that the origions of music lie in territory, emotion and sex.