On Wikipedia https://en.wikipedia.org/wiki/Hortus_Musicus
Alternative Spellings Early Music Consort "Hortus Musicus"
Creation 1972
City Tallinn, Estonia
Country Estonia

Hortus Musicus is an Estonian ensemble that was established in 1972 by Andres Mustonen, a violin student of the Tallinn State Conservatory. Hortus Musicus specialises in performing early music, including 8th–15th-century European forms such as Gregorian Chant, Organum, Medieval Liturgic Hymns and Motets, the Franco-Flemish School, and Renaissance Music (including French chansons, villanelles and Italian madrigals). The group also presents early, non-European styles including Indian Ragas, Israeli temple songs, Arabian mughams and Jewish music. The group's repertoire has also included pieces by 20th-century composers (often created specially for Hortus Musicus, e.g. by Arvo Pärt). wikipedia