Current thought is that man came from monkey many many years ago. Indeed, the homology between man and monkey genes could be up to 90 or 95%. However, the basic fact is that monkey has 48 chromosomes and man has 46. Are humans getting smarter by dropping two monkey chromosomes, or are monkeys getting stupid by gaining two extra non-human chromosomes ? Since monkeys can’t sing well, these two extra monkey chromosomes must interfere singing. Anyway, humans can sing much better and singing is good for our health. Singing might contribute to longer human lifespan. More in a new book at http://sjmedmusic.com/purchase-music-and-human-health