You probably think: "What a voice, no need to explain - it knows everyone". So? But this word has not the same value, and the voices are different.
The sound of voices occurs as well as any musical sound extracted on a wind instrument. The air we breathe, leaves the lungs through the windpipe in the throat. In the larynx are the vocal cords. Under pressure of exhaled air, they begin to fluctuate, and you can hear the sound.
Each musical instrument has a resonator. In humans, the role of the resonator play the mouth and nose (this is called the parent resonator), but also the chest (thoracic cavity). You heard, perhaps, the terms chest voice. The height of the human voice depends on the size of the vocal cords is their length and thickness. From the peculiarities of their structure depends on the timbre of individual coloration of the sound by which we distinguish the voices of familiar people.
Singing voice, of course, you know, are different - high, low and medium. Male voices are separated on the tenor, baritone and bass, the female is a soprano, mezzo-soprano and contralto. And the children's singing voices only two groups - soprano and viola (choir boys high voice called distantly).
In music there are other concepts associated with the word "voice". You probably had to hear: two-voice invention, a three-part Fugue, a four-part presentation. In this case, the voice refers to the melody, which is part of the musical fabric of the play. Those of you who are studying in the school of music, probably, know, that two-part inventions - these are pieces in which in each hand sounds an independent melody, and not the melody and the accompaniment, as in other plays. Three-part invention or a Fugue is a piece in which there are three independent melodic voices.
Works with two or more independent voices called polyphonic. You can read about them in stories, dedicated polyphony, invention and Fugue.
In polyphony there is the concept of voicings is a movement of each of the voices polyphonic, that is, a polyphonic composition. The voice-leading is subject to his own laws, which must study composers.
And another concept associated with the same word. Voices called party individual instruments in ensemble and orchestral works. You can hear, for example: "you Should write the score for a vote. This means that the composer gives to the performance score, and the scribes have to write it all performers of their party: in orchestral composition, for example, to write as many games violins, but in this orchestra remotes violinists, many times to write a lot of bass, how many remotes double-bass, etc.