That's a good question. China's music seems impressionistic of the natural surroundings, lacking as you say a central focus on the human role within it. I wonder whether the otherworldly emphasis of Egyptian culture would be much influenced by natural cycles, or if so perhaps more to the aim of currying the favor of the gods to bring favorable harvests and the seasonal flooding that kept the soil fertile. I think anyway that music would have had a highly specific, ritualized role in society. It's worth looking into this further. Was their music purely ceremonial to effect social unity in various aspects of life or did it have shamanistic intent?