It seems like any scientific understanding of music is incomplete without understanding singing in gibbons: http://www.gibbons.de/main/sound.html http://www.gib

It seems like any scientific understanding of music is incomplete without understanding singing in gibbons: http://www.gibbons.de/main/sound.html http://www.gibbons.de/main/sound.html Specific reasons for gibbon song rather than others: 1) duh, they are apes 2) unlike birds and cetaceans, but like humans, gibbons try to aim for a pure tone when singing, with energy concentrated at the fundamental frequency 3) unlike birds and cetaceans, but like humans, gibbons try to harmonize when singing in groups