Singing's the act of producing musical sounds with the voice, which's often contrasted with regular speech. A person who sings's called a singer or vocalist. Singers perform music known as songs that can either be sung a cappella (without accompaniment) or accompanied by musicians and instruments ranging from a single instrumentalist (a duet with a piano) to a full symphony orchestra or big band. Singing's often done in a group of other musicians, such as in a choir of singers with different vo… (More on Singing)