the musical director of a choir
"The new cantor led the congregation in singing the hymns with great passion during Sunday service."
singer, especially someone who takes a special role of singing or song leading at a ceremony
"The cantor led the congregation in prayer with a voice that filled the entire synagogue during the high holidays."
A surname.
"After years of searching, the family finally found their genealogical records proving that my great-grandfather's name was indeed Cantor."