Book excerpt: This innovative manual provides 148 Figures and Tables, deducted from a recently enlarged database of more than 1.000 phonetograms (Voice Range Profiles) from professional voice users (singers, actors, and dancers) of both genders, of ages between 8 and 88 years. The E.T.M. (Eclectic Therapy Method) offers the possibility to objectively evaluate, in real time, the capacities of a given voice, as expressed by the different parameters for each tone of the vocal range, and to expand them to their maximum potentiality, considering the general rules of vocal hygiene. This way, the interested reader can compare their own results of voice analysis, voice education or voice therapy with the exceptional data provided in this study.