Singing is the act of producing music through one’s voice. It expands on normal speech with the use of tone and rhythm. The person who sings is called a singer or a vocalist. Singers interpret music, known as songs, and can sing acapella (without an ensemble) or accompanied by musicians and instruments (ranging from one instrumentalist to a whole symphonic orchestra). Singing can be done in a group with other musicians (like in a choir with musicians with different vocal ranges), or with an instrumental ensemble (like in a rock band, or in a baroque ensemble).