Gregorian Choir of the Grimbergen Abbey , Schola Gregoriana Mediolanensis & Monks' Choir of the Abbey of St. Ottilien

Comprised of:

1. Gregorian Choir of the Grimbergen Abbey Group, Began: in
2. Schola Gregoriana Mediolanensis Choir, Began: 1980 in
3. Monks' Choir of the Abbey of St. Ottilien Group, Began: in