chorus
singers in a body; a refrain
Today this word meansA group singing together, or the group itself. The refrain of a song.
The khoros was a troupe that sang and danced as one. In Greek tragedy they comment on the action and ask questions on the audience's behalf.
In the days of a single actor, half the play belonged to this chorus.
The name of Terpsichore, Muse of dance, carries the word inside it.