choir — A choir is a group of people who sing together, for example in a church or school.
chorale — A chorale is a piece of music sung as part of a church service.
glee club — a chorus organized for singing choral music.
singer — Isaac Bashevis [bah-shev-is] /bɑˈʃɛv ɪs/ (Show IPA), 1904–91, U.S. novelist and short-story writer (in Yiddish), born in Poland: Nobel prize 1978.
musician — a person who makes music a profession, especially as a performer of music.
performer — to carry out; execute; do: to perform miracles.