Vocals

A singer is a person who sings. Anyone who is singing is a singer. Some people do it as a job (professional singer), others may sing without being paid (amateur singer). Singers may sing anything: songs, opera etc. They may be accompanied by an instrument or an orchestra. Some singers also play a musical instrument such as piano, guitar or harp while they sing (they accompany themselves). Singing is important in movies and in the theatre.

(source: https://simple.wikipedia.org/wiki/Singer)