Sopranos
Probably the most important job of the soprano section in a choral group is to carry the melody. When a person is listening to a song, the dominant part they hear and naturally gravitate towards singing along with is called the melody of the song. It, many times, is the part that really catches you and gets stuck in your head. This part is most often sung by a soprano voicing, mainly because sopranos are the highest voicing, and that naturally lends to volume and dominance.
Altos
Nowadays, the word “alto” is a general term used to describe a lower female voice rather than a specific vocal category. Chorus music usually calls for an “alto” part for voices with a strong middle and lower register, but there’s no real separate alto voice type in Western music.
Basses
In SATB four-part mixed chorus, the bass is the lowest vocal range, below the tenor, alto, and soprano .
