The Kodaly method took all the best bits of Tonic Solfa and phonetic rhythm (sounds like a form of contraception!) and added in some hand signals. Okay, there's more to it than that...!

This was recommended for use with children as young as two years, as it seems 'perfect pitch' can be taught to children at that age, but not so easily later.

Apparently it is in line with children learning to speak - some African languages use complicated clicking sounds, which small children pick up easily, but the facility to learn diminishes rapidly with age.