Dennis Claxton wrote:
>I don't know how to say it, the music
> or melody of language before they begin making grammatically coherent
> sentences or even forming real words.
There's quite a bit of research (none of which I can remember now thought I once knew some of it) on the importance of babbling as a preliminary to learning to speak. Hence also the importance of adult's "baby talk." See some of the literature on "wolf children."
Carrol