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"SPEAK CANTONESE IN 7 DAYS" The 6-Tone Concept (known aslo as The Theory of the Hexatave) has made an important assertion, namely that a tone is invariably incorporated into every sound uttered when human beings speak, and the sound so produced is confined to a band within which there are 6 tones. It further claims that once we know the 6 tones in this band, the process of teaching and learning how to speak the words of a new language can be simplified. The efficiency of SPEAK CANTONESE IN 7 DAYS is a solid proof of this claim.