Evolutionary Malarkey

I'm listening to Richard Dawkins' The Greatest Show on Earth (as well as The God Delusion - I'm totally double-doing my audio books right now). I'm at the part of the book where he's detailing out genus and species classifications, how those come about and are applied, and how such categories make a mess of the concept of evolution when talking about intermediaries (read: "missing links"). There are even fossils that different anthropologists can't decide on what the scientific names for them should be, because they are too much in between two other genus/species classifications.

You know, a spectrum is a spectrum, and the artists of the world learned that it's possible to have blue-green and green-blue, so why can't the anthropologists accept that as well, and just call some important bones Homo-Austalopithecus or Australopithecus-Homo and be done with it?

Also, why don't we speak in musical sounds instead of words? Granted, we have intonation, but I'm just thinking about how I can "understand" music regardless of the language of its author. I bet that's why whale song is sung, instead of articulated.