very instrument has a certain quality, a texture or timbre, volume, pitch, and resonance that give it a unique signature. Even between similar instruments, two drums will vary in sound slightly, though many of the qualities may be the same. But there is no instrument that has a more varied individual signature than the voice. Every voice carries a blueprint for the person for whom it occupies, and as soon as someone speaks, listeners are translating that blueprint at the subconscious level. We can tell if someone is tired, excited, feeling ill, cautious or a range of other emotions, even without knowing them very well. There are messages and intentions behind the actual words being spoken that we are able to interpret just from the quality of the voice.