The name Anonymous Four is quite important to early music. It represents two identities: the first, Anonymous IV, is an unknown writer of an important treatise of medieval music theory, particularly about the music of Notre Dame in Paris in the 13th Century. The second, Anonymous 4, is a contemporary female vocal quartet specializing in medieval music. They began their career in 1992 and are still performing quite regularly. This Continuum presents music of both of these Anonymous Fours.