Cantor
A cantor (also called a chanter, psaltis) is a lay person who may assist the priest by chanting responses and hymns in the services or sacraments of the church.
In modern use, the role of the cantor has been replaced, to some extent, by choirs. In this setting, the cantor is sometimes considered the choir director or the person to lead in congregational singing.
In Judaism, the cantor is called a hazzan.