The voice

There are many different types of voices in music, there is soprano mainly females that sing with a higher pitch, tenor could be a low female voice or male voice, falsetto is a male singing really high and there's also bass which is very very low voice sung by boys.  

Acapella music is sung by peoples voices no instruments nothing but their voices. 

With performing or singing warming up your vocals is very helpful. It not only stretches out your vocal chords but it should help with your whole body your face, chest stomach and it should help with your breathing aswell. 

Vocal range is how low someone can go with their voice and how high they can go. 5 good examples are Mariah carey five-octave range and has the ability to reach beyond the 7th-octive. 

A fewe celebs vocal range- 

Ariana Grande, D3 - B5 - E7, Ariana is a light soprano 

Miley Cryus can be a soprano but her voice is slightly thicker so technically she is a mezzo-soprano.