Biography
Similar to the Bayreuth Festival Orchestra the Bayreuth Festival Chorus is a temporary ensemble of currently 151 voluntary members coming from well-known opera houses, radio stations and also individual opera singers. See the official homepage of the Bayreuth Festival for a list of members and more infos:
https://www.bayreuther-festspiele.de/en/contributors/festival-chorus/
Biography text from Last.fm, available under CC BY-SA.