From SuspireWiki

Chorus is not an actual title in the covenant, but rather a descriptor for the collective “new converts” to Acolyte ideology, and a probationary member of the Circle. Few would-be converts are capable of grasping the often painful truth of the Acolytes’ mindset, so most new members go through a period of “apprenticeship” during which they slowly acclimate to existence in the Circle of the Crone. As a point of order, covenant secrets such as Crúac are never revealed to the chorus, and they are watched just as much as guided for the duration of their probation. This introductory period exists as much for the chorus’ security as the covenant’s, for once members are fully inducted, there is truly no turning back.