Back cover of the source disc, Koch Schwann 3-1270-2 Y8 (scans/scannen0002.jpg in the rip): "Choeurs de Lyon / Chef des Choeurs: Bernard Tetu". operadis (http://www.operadis-opera-discography.org.uk/CLMAGRIS.HTM) independently gives Chorus - Choeurs de Lyon for this recording. Choeurs de Lyon is Bernard Tetu-s chamber choir, not the Opera de Lyon chorus, which is what the record said.